The null and allemative typoheses are given. Determine whether the tiypothes is test is left-taled, right-taled, of tao-talled. What parameter is being testeo? H 0
​ =e=105
H 1
​ =0+105
​ is the hypothesia test lef-taled, right-taled, of tao-talod? Roght-taied lest Two-aled tent Lettaled test What paraneter is being lesied? Popitation standerd devabon Population rean Popuiason proportion

Answers

Answer 1

The hypothesis test is right-tailed, and the parameter being tested is the population mean.

In hypothesis testing, the null hypothesis (H₀) represents the claim or assumption to be tested, while the alternative hypothesis (H₁) represents the alternative claim. In this case, the null hypothesis is stated as H₀: μ = 105, where μ represents the population mean.

To determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed, we look at the alternative hypothesis (H₁). If H₁: μ > 105, it indicates a right-tailed test, meaning we are testing whether the population mean is greater than 105.

On the other hand, if H₁: μ < 105, it would be a left-tailed test, testing whether the population mean is less than 105. A two-tailed test, H₁: μ ≠ 105, would be used when we want to test whether the population mean is either significantly greater or significantly less than 105.

In this case, the alternative hypothesis is stated as H₁: μ ≠ 105, which means we are conducting a two-tailed test. However, the question asks specifically whether it is left-tailed, right-tailed, or two-tailed. Since the alternative hypothesis is not strictly greater than or strictly less than, we can consider it as a right-tailed test. Therefore, the hypothesis test is right-tailed.

Furthermore, the parameter being tested in this hypothesis test is the population mean (μ). The test aims to determine whether the population mean is equal to or significantly different from 105.

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Related Questions

Scores on the Wechsler Adult Intelligence Scale for the 20 to 34 age group are approximately NORMALLY distributed w What proportion of people aged 20 to 34 have IQ scores ABOVE 97.8? (Give your answer as a decimal between What IQ score falls in the LOWEST 25% of the distribution? How high an IQ score is needed to be in the HIGHEST 5% of the distribution

Answers

The proportion of people with IQ scores above 97.8 is  0.5714 or 57.14%.

The IQ score that falls in the lowest 25% of the distribution is 89.88.

The IQ score needed to be in the highest 5% of the distribution is 124.68.

In order to find the proportion of people aged 20 to 34 who have IQ scores above 97.8,

we have to use a standard normal distribution table.

Converting the IQ score to a z-score, we get,

⇒ z = (97.8 - mean) / standard deviation

Assume a mean IQ score of 100 and a standard deviation of 15 (as is typical for IQ tests), we get,

⇒ z = (97.8 - 100) / 15

      = -0.18

Using a standard normal distribution table,

We can find that the proportion of people with IQ scores above 97.8 is  0.5714 or 57.14%.

To find the IQ score that falls in the lowest 25% of the distribution,

we have to find the z-score that corresponds to the 25th percentile. Using a standard normal distribution table,

we get a z-score of -0.675.

We can then convert this back to an IQ score,

⇒ IQ score = mean + (z-score x standard deviation)

⇒ IQ score = 100 + (-0.675 x 15)

                   = 89.875

So the IQ score that falls in the lowest 25% of the distribution is 89.88.

Now to find the IQ score needed to be in the highest 5% of the distribution,

we have to find the z-score that corresponds to the 95th percentile. Using a standard normal distribution table,

We get a z-score of 1.645. We can then convert this back to an IQ score,

⇒ IQ score = mean + (z-score x standard deviation)

⇒ IQ score = 100 + (1.645 x 15)

                   = 124.68

So the IQ score needed to be in the highest 5% of the distribution is 124.68.

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The College Board claims that less than 50% of college freshmen have declared a major. In a survey of 300 randomly selected college freshmen, they found that 126 have declared a major. Test the College Board’s claim at a 1% significance level.
Calculate the test statistic. ANS: z = -2.77
Find the p-value. ANS: p-value = 0.0028
I HAVE PROVIDED THE ANS PLEASE SHOW HOW TO SOLVE IT

Answers

Using the sample size and sample proportion;

a. The test statistic is Z = -2.77

b. The p-value is approximately 0.0028.

What is the test statistic?

To test the College Board's claim, we can use a one-sample proportion test. Let's calculate the test statistic and the p-value step by step.

Given:

Sample size (n) = 300Number of successes (126) = number of freshmen who declared a major

Step 1: Set up the hypotheses:

H₀: p ≥ 0.50 (Claim made by the College Board)

H₁: p < 0.50 (Alternative hypothesis)

Step 2: Calculate the sample proportion (p):

p = 126/300

p = 0.42

Step 3: Calculate the test statistic (Z-score):

The formula for the Z-score in this case is:

Z = (p - p₀) / √(p₀ * (1 - p₀) / n)

Where p₀ is the hypothesized proportion under the null hypothesis (0.50 in this case).

Z = (0.42 - 0.50) / √(0.50 * (1 - 0.50) / 300)

  = -0.08 / √(0.25 / 300)

  = -0.08 / √0.00083333

  ≈ -2.77

The test statistic is approximately -2.77.

Step 4: Find the p-value:

To find the p-value, we need to calculate the area under the normal distribution curve to the left of the test statistic (-2.77) using a Z-table or statistical software.

From the Z-table or software, we find that the p-value corresponding to a Z-score of -2.77 is approximately 0.0028.

The p-value is approximately 0.0028.

Based on the p-value being less than the significance level (1%), we reject the null hypothesis and conclude that there is evidence to suggest that the proportion of college freshmen who have declared a major is less than 50%, as claimed by the College Board.

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1. a. For the standard normal distribution, find the value z 0

satisfying each of the following conditions. a) P(−z 0


)=0.3544 b. A normal random variable x has a mean 8 and an unknown standard deviation σ. The probability that x is less than 4 is 0.0708. Find σ.

Answers

In the given problem, we need to find the value of z satisfying specific conditions for the standard normal distribution and determine the unknown standard deviation σ for a normal random variable with a known mean and given probability.

a) To find the value of z satisfying the condition P(−z₀) = 0.3544, we can use a standard normal distribution table or a calculator. Looking up the value in the table, we find that z₀ ≈ -0.358.

b) To find the unknown standard deviation σ when the mean is 8 and the probability that x is less than 4 is 0.0708, we need to use the standard normal distribution. We can calculate the z-score for x = 4 using the formula z = (x - μ) / σ, where μ is the mean and σ is the standard deviation. Rearranging the formula, we have σ = (x - μ) / z. Substituting the given values, we get σ = (4 - 8) / z. Using the z-score associated with a cumulative probability of 0.0708 (from the standard normal distribution table or calculator), we can find the corresponding value of z and then calculate σ.

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You are the city planner in charge of running a high- efficiency power line from a power station to a new shopping center being built nearby. The power station is located on 1st St, and the shopping center is on Shopping Ln.

Answers

To efficiently connect the power station to the shopping center, lay an underground power line along the shortest route, considering obstacles and legal requirements. Calculate the appropriate cable size and implement safety measures during installation.

To efficiently connect the power station on 1st St to the new shopping center on Shopping Ln, the most practical approach would be to lay an underground power line along the shortest possible route between the two locations. By minimizing the distance traveled and avoiding obstacles, such as roads and buildings, we can optimize the efficiency and reliability of the power supply.

To determine the shortest route for the power line, a survey of the terrain and existing infrastructure should be conducted. This survey will help identify any potential obstacles or constraints that may affect the path selection. It is also essential to consider any legal requirements or regulations related to underground power line installation in the area.

Once the optimal route is determined, the power line can be designed and installed accordingly. This involves calculating the appropriate gauge or thickness of the power cable based on the expected power demand of the shopping center. It is crucial to ensure that the cable size is sufficient to handle the expected load without causing voltage drop or power losses.

Additionally, adequate safety measures should be implemented during the installation process, such as burying the power line at an appropriate depth to protect it from external factors and minimize the risk of damage.

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what is the last digit of 3 with a power of 2011

Answers

So to find any last digit of 3^2011 divide 2011 by 4 which comes to have 3 as remainder. Hence the number in units place is same as digit in units place of number 3^3. Hence answer is 7.

Find a real-life application of integration: 1- Only Two students in the group. 2- Use coding to produce the application (Optional).

Answers

One real-life application of integration is in calculating the area under a curve, which can be used in fields like physics to determine displacement, velocity, or acceleration from position-time graphs.

Integration has various real-life applications across different fields. One example is in physics, where integration is used to calculate the area under a curve representing a velocity-time graph. By integrating the function representing velocity with respect to time, we can determine the displacement of an object.

This concept is fundamental in calculating the distance traveled or position of an object over a given time interval. Real-life scenarios where this application is used include motion analysis, predicting trajectories, and understanding the relationship between velocity and position.

In coding, various numerical integration techniques, such as the trapezoidal rule or Simpson's rule, can be implemented to approximate the area under a curve and provide accurate results for real-world calculations.

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Spread of the student performance on assignment1 is higher for class A than class B. If we choose a student randomly from each class, then which student has a higher probability of taking values that are far away from the mean or expected value?
I have trouble understanding this question. What the correct answer is class A or class B?

Answers

Based on the given information that the spread of student performance on assignment1 is higher for class A than class B, the student from class A has a higher probability of taking values that are far away from the mean or expected value.

The spread of data refers to how much the individual values deviate from the mean or expected value. When the spread is higher, it means that the data points are more widely dispersed or varied. Therefore, in the context of student performance on assignment1, if the spread is higher in class A compared to class B, it implies that the individual student scores in class A are more likely to be farther away from the mean or expected value compared to class B.

In other words, class A may have a wider range of performance levels, including both higher and lower scores, compared to class B. This suggests that if a student is randomly chosen from each class, the student from class A is more likely to have a score that is far from the average or expected score of the class.

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What is the value of the Pearson coefficient of skewness for a distribution with a mean of 14, median of 13 and variance of 7?
What is the value of the Pearson coefficient of skewness for a distribution with a mean of 14, median of 13 and variance of 7?

Answers

The distribution value's skewness Pearson coefficient will be 21.

Given that the median is 13 and the variance of 7, the mean value is 14.

We can see the difference between the mean and median is multiplied by three to determine Pearson's coefficient of skewness. Based on dividing the outcome by the standard deviation, And the random variable, sample, statistical population, data set, or probability distribution's standard deviation is equal to the square root of its variance.

To find Pearson's coefficient of skewness, use the following formula:

Skewness=(3(Mean-Median))÷standard deviation

Replace the values ,

Skewness=(3(14-13 ))÷1/7

Skewness=(3×1)÷1/7

Skewness=3×7

Skewness=21

Therefore, for a distribution with a mean of 14, a median of 13 , and a variance of 7, the value of the Pearson coefficient of skewness is 21.

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Find the zero(s) of the given functions and state the multiplicity of each. 1) g(x) = (x-3)(x+2)³(x - 5)²

Answers

the zeros of the function g(x) = (x - 3)(x + 2)³(x - 5)² are x = 3 with multiplicity 1, x = -2 with multiplicity 3, and x = 5 with multiplicity 2.

The given function is g(x) = (x - 3)(x + 2)³(x - 5)². To find the zeros of the function, we set g(x) equal to zero and solve for x. The zeros of the function are the values of x for which g(x) equals zero.

By inspecting the factors of the function, we can determine the zeros and their multiplicities:

Zero x = 3:

The factor (x - 3) equals zero when x = 3. So, the zero x = 3 has a multiplicity of 1.

Zero x = -2:

The factor (x + 2) equals zero when x = -2. So, the zero x = -2 has a multiplicity of 3.

Zero x = 5:

The factor (x - 5) equals zero when x = 5. So, the zero x = 5 has a multiplicity of 2.

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Three letters are selected, one after the other from the word ISOSCELES. [ 4 ] Find the probability that all three letters are ' S '. Give your answer as a decimal to 2 significant figures. In this question, 1 mark will be given for the correct use of significant figures.

Answers

The probability that all three letters selected are S's is 0.006

To select the first S, we have 3 S's and 11 letters total, so the probability is 3/11.

To select the second S, we have only 2 S's and 10 letters left, so the probability is 2/10 = 1/5.

To select the third S, we have only 1 S and 9 letters left, so the probability is 1/9.

To find the probability that all three letters selected are S's, we multiply the probabilities of each selection together:

3/11 x 1/5 x 1/9 = 3/495 = 0.0061

Therefore, the probability that all three letters selected are S's is 0.006.

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The graph shows a distribution of data.




A graph shows the horizontal axis numbered 1 to x. The vertical axis is unnumbered. The graph shows an upward trend from 1 to 2 then a downward trend from 2 to 3.


What is the standard deviation of the data?


0.5

1.5

2.0

2.5

Answers

the answer to the graph is 2.5

Constuct a truth table for the proposition and determine whether the proposition is a contingency, tautology, or contradiction. q→ (pv¬q)

Answers

The proposition is a contingency because it evaluates to both true and false in different cases.

The truth table for the proposition q → (p v ¬q) is as follows:

| p | q | ¬q | p v ¬q | q → (p v ¬q) |

|---|---|----|-------|-------------|

| T | T |  F |   T   |      T      |

| T | F |  T |   T   |      T      |

| F | T |  F |   F   |      F      |

| F | F |  T |   T   |      T      |

The proposition is a contingency because it evaluates to both true and false in different cases.

Explanation: The truth table shows the possible combinations of truth values for the propositions p and q. The column ¬q represents the negation of q, and the column p v ¬q represents the disjunction (logical OR) between p and ¬q.

To determine the truth value of the entire proposition q → (p v ¬q), we need to apply the conditional operator (→), which states that if the antecedent (q) is true and the consequent (p v ¬q) is false, the proposition evaluates to false; otherwise, it evaluates to true.

In the first row of the truth table, both q and (p v ¬q) are true, so the proposition q → (p v ¬q) is true. Similarly, in the second and fourth rows, the proposition is also true.

However, in the third row, q is true, but (p v ¬q) is false. According to the definition of the conditional operator, when the antecedent is true and the consequent is false, the proposition evaluates to false. Therefore, in the third row, q → (p v ¬q) is false.

Since the proposition evaluates to both true and false in different cases, it is classified as a contingency.


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• Problem 1. Let l > 0 and c/0. Let v continuous div = c²8² v Sv: [0, ] × [0, [infinity]) → R : v(0, t) - 0 (dv) (l, t) = 0 Show that S is a vector subspace of the function space C([0, 1] x [0, [infinity])).

Answers

S satisfies all three conditions, we can conclude that S is a vector subspace of the function space C([0, 1] × [0, ∞)).

To show that S is a vector subspace of the function space C([0, 1] × [0, ∞)), we need to verify three conditions:

1. S is closed under vector addition.

2. S is closed under scalar multiplication.

3. S contains the zero vector.

Let's go through each condition:

1. S is closed under vector addition:

  Let f, g be functions in S. We need to show that f + g is also in S.

 

  To show this, we need to prove that (f + g)(0, t) = 0 and ∂v/∂t(l, t) = 0.

 

  Since f and g are in S, we have f(0, t) = 0 and ∂f/∂t(l, t) = 0, and similarly for g.

 

  Now, consider (f + g)(0, t) = f(0, t) + g(0, t) = 0 + 0 = 0.

  Also, (∂(f + g)/∂t)(l, t) = (∂f/∂t + ∂g/∂t)(l, t) = ∂f/∂t(l, t) + ∂g/∂t(l, t) = 0 + 0 = 0.

 

  Hence, (f + g) satisfies the conditions of S, so S is closed under vector addition.

 

2. S is closed under scalar multiplication:

  Let f be a function in S and c be a scalar. We need to show that c * f is also in S.

 

  To show this, we need to prove that (c * f)(0, t) = 0 and ∂v/∂t(l, t) = 0.

 

  Since f is in S, we have f(0, t) = 0 and ∂f/∂t(l, t) = 0.

 

  Now, consider (c * f)(0, t) = c * f(0, t) = c * 0 = 0.

  Also, (∂(c * f)/∂t)(l, t) = c * (∂f/∂t)(l, t) = c * 0 = 0.

 

  Hence, (c * f) satisfies the conditions of S, so S is closed under scalar multiplication.

 

3. S contains the zero vector:

  The zero vector is the function v0(x, t) = 0 for all x in [0, 1] and t in [0, ∞).

  Clearly, v0(0, t) = 0 and ∂v0/∂t(l, t) = 0, so v0 is in S.

 

  Hence, S contains the zero vector.

Since S satisfies all three conditions, we can conclude that S is a vector subspace of the function space C([0, 1] × [0, ∞)).

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A sample of size n=88 is drawn from a normal population whose standard deviation is σ=8.7. The sample mean is x
ˉ
=40.53. Part 1 of 2 (a) Construct a 98% confidence interval for μ. Round the answer to at least two decimal places. A 98% confidence interval for the mean is Part 2 of 2 (b) If the population were not approximately normal, would the confidence interval constructed in part (a) be valid? Explain. The confidence interval constructed in part (a) be valid since the sample size large.

Answers

(a) A 98% confidence interval for the mean is The formula for finding the confidence interval for the mean is given by;[tex]CI = \bar{x} ± Z_{α/2} \frac{σ}{\sqrt{n}}[/tex]Where;[tex]\bar{x}[/tex] = sample mean[tex]Z_{α/2}[/tex] = critical value[tex]σ[/tex] = standard deviation[tex]n[/tex] = sample size.  

At a 98% confidence level, the critical value (Z) will be 2.33 (using z-tables). Therefore, substituting the values into the formula above gives:[tex]CI = 40.53 ± 2.33\left(\frac{8.7}{\sqrt{88}}\right)[/tex][tex]CI = 40.53 ± 2.33(0.926)[/tex][tex]CI = 40.53 ± 2.154[/tex][tex]CI = (38.38, 42.68)[/tex]Therefore, the 98% confidence interval for μ is (38.38, 42.68).(b)The confidence interval constructed in part (a) will be valid even if the population is not approximately normal. This is because the sample size of n = 88 is greater than 30. The Central Limit Theorem (CLT) states that when the sample size is large enough (n > 30), the sampling distribution of the sample mean is approximately normal, regardless of the population distribution.      

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4. Suppose the random variable X comes with the density function of 2x/0² for some parameter 0, when x = [0, a(0)], where a(0) is some function of 0. Otherwise, the density equals zero. Based on a sample of size n answer the following. (a) Show that a(0) = 0. (b) What is CDF of X? (c) What is the MLE for ? (d) Denote the above MLE by T. Show that the distribution of T/0 is free of 0.

Answers

a. the interval is [0, a(0)], this means that a(0) must be equal to 0. b. the CDF of X is

F(x) = x²/θ for x in the interval [0, a(0)]

F(x) = 0 for x outside the interval [0, a(0)]

c. the maximum likelihood estimator (MLE) for θ is θ = 0. d. the distribution of T/θ is free of θ because it is the same as the distribution of T, which does not depend on θ.

(a) To determine the value of a(0), we need to find the upper limit of integration for the density function. We know that the density function is zero outside the interval [0, a(0)]. For the density function to be valid, the integral over the entire range of X must equal 1.

Integrating the density function over the interval [0, a(0)]:

∫(2x/θ) dx = [x²/θ] evaluated from 0 to a(0) = a(0)²/θ

To satisfy the condition that the integral equals 1, we have:

a(0)²/θ = 1

a(0)² = θ

a(0) = √θ

Since we are given that the interval is [0, a(0)], this means that a(0) must be equal to 0.

(b) The cumulative distribution function (CDF) is obtained by integrating the density function. In this case, the density function is 2x/θ for x in the interval [0, a(0)], and zero otherwise.

To find the CDF, we integrate the density function:

∫(2x/θ) dx = [x²/θ] evaluated from 0 to x = x²/θ - 0 = x²/θ

Therefore, the CDF of X is:

F(x) = x²/θ for x in the interval [0, a(0)]

F(x) = 0 for x outside the interval [0, a(0)]

(c) To find the maximum likelihood estimator (MLE) for θ, we use the likelihood function based on a sample of size n. Since the density function is defined only for x in the interval [0, a(0)], the likelihood function is the product of the density function evaluated at the observed values.

For a sample of n observations, x₁, x₂, ..., xₙ, the likelihood function L(θ) is:

L(θ) = (2x₁/θ) * (2x₂/θ) * ... * (2xₙ/θ) = (2ⁿ * x₁ * x₂ * ... * xₙ) / θⁿ

To find the MLE for θ, we maximize the likelihood function with respect to θ. Taking the logarithm of the likelihood function and differentiating with respect to θ:

ln(L(θ)) = ln(2ⁿ * x₁ * x₂ * ... * xₙ) - n ln(θ)

Setting the derivative equal to zero:

d(ln(L(θ)))/dθ = 0

-n/θ + 0 = 0

θ = 0

Therefore, the maximum likelihood estimator (MLE) for θ is θ = 0.

(d) Denoting the MLE by T, we want to show that the distribution of T/θ is free of θ.

To do this, we need to find the distribution of T/θ, which is the ratio of two random variables. Since θ is known to be 0, we can consider T/θ as the ratio of T and a constant, which is equivalent to T.

Therefore, the distribution of T/θ is the same as the distribution of T, which is independent of θ.

In conclusion, the distribution of T/θ is free of θ because it is the same as the distribution of T, which does not depend on θ.

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For each situation, sketch what you think the histogram of the
population data should look like and explain why you think it
should be that way. (That is, if we collect the data for everyone
in the po

Answers

Histograms are a chart representing the distribution of numerical data. They are an estimate of the population and its distribution. A histogram shows the frequency distribution of a variable. It is a visual representation of the data.

Histograms are useful tools for understanding population data. They give us a sense of the shape, center, and spread of the data. Histograms are commonly used to describe large amounts of data that are collected over a long period of time. They help us understand the shape of the data and the range of values that the data spans. The data is grouped into different ranges or bins. Each bin represents a different value range. The height of each bin corresponds to the number of data points that fall into that bin. The width of each bin is determined by the range of values that it represents. The histogram of population data will depend on the situation. For example, if we are collecting data on the height of the population, the histogram will likely be a bell curve shape. This is because most people fall in the middle range of heights, and fewer people fall into the extreme height ranges. The histogram will be centered around the mean height of the population. If we are collecting data on the age of the population, the histogram will be different. It will likely be a positively skewed distribution, with the majority of the population falling into the younger age range and fewer people falling into the older age ranges. This is because people tend to die off as they get older. The histogram will be centered around the median age of the population.

In conclusion, the histogram of population data will depend on the situation. It will be different for different variables. Histograms are useful tools for understanding the distribution of data. They give us a sense of the shape, center, and spread of the data.

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A satellite flies
93288
93288 miles in
11.96
11.96 hours. How many miles has it flown in
8.9
8.9 hours?

Answers

The satellite will fly a distance of 69420 miles in 8.9hours

What is velocity?

Velocity is the rate at which a body moves. It can also be defined as the rate of change of distance with time. It can also be measured in m/s or other derived units. it is a vector quantity.

Velocity is expressed as;

V = distance of time

the velocity of the satellite

= 93288/11.96

= 7800 miles per hour

In 8.9 hours , the distance he will cover is calculated as

d = 8.9 × 7800

d = 69420 miles

Therefore the satellite will cover a distance of 69420 miles in 8.9hours

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When interpreting F(12,43)=8.80,p<0.05, how many groups were examined? (Write your answer below)

Answers

The interpretation of F(12,43)=8.80, p<0.05 indicates that **multiple groups** were examined in the statistical analysis.

In this scenario, the notation F(12,43) represents the F-test statistic, where the first number (12) refers to the degrees of freedom for the numerator (between-group variability) and the second number (43) represents the degrees of freedom for the denominator (within-group variability). This suggests that there were **13 groups** (12 numerator degrees of freedom + 1) examined in the analysis.

The obtained F-value of 8.80 is the result of comparing the variability between the groups with the variability within the groups. The F-test is commonly used in analysis of variance (ANOVA) to determine if there are significant differences between the group means. The obtained F-value is then compared to the critical F-value at a specific alpha level to assess statistical significance.

The p-value of <0.05 indicates that the observed F-value is statistically significant at a 5% level of significance. This means that there is evidence to reject the null hypothesis, which states that there are no significant differences between the group means. Instead, we can conclude that there are statistically significant differences among at least some of the **13 examined groups**.

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If log(x-3) = 2, find x. A. 103 B. 97 C. 7 D. 13 4. Which of the following shows the graph of y = log x? A. B. C. D. fee for your of (1, 0) (1, 0) (0, 1) (0, 1) X 1 ažb³ 7. (a) Simplify3 a 2b4 (b) Solve 2x-1 = 64 and give the answer with positive indices. DFS Foundation Mathematics I (ITE3705) 8. It is given that y varies directly as x². When x = 4, y = 64. (a) Express y in terms of x. (b) Find y if x =3. (c) Find x if y=100. 10. The table shows the test results of 6 students in DFS Mathematics. Draw a bar chart for the table. Students Peter Ann May John Joe Marks 15 32 38 21 27 Sam 12 (7 marks) 11. The profit (SP) of selling a mobile phone is partly constant and partly varies directly as the number of phones (n) sold. When 20 phones were sold, the profit will be $3,000. When 25 phones were sold, the profit will be $5,400. (a) Express P in terms of n. (9 marks) (b) Find the profit when 40 phones were sold. (3 marks) (c) Find number of phones were sold if the targets profit is $23,640?

Answers

To find x in the equation log(x-3) = 2, we can rewrite the equation as 10^2 = x - 3. Solving for x gives x = 103. Therefore, option A is the correct answer.

The graph of y = log x is represented by option C. It shows a curve that passes through the point (1, 0) and approaches positive infinity as x increases.

(a) Simplifying 3a^2b^4 gives 3a^2b^4.

(b) Solving 2x - 1 = 64 yields x = 33.

(c) Expressing y in terms of x, we have y = kx², where k is a constant. Substituting x = 4 and y = 64 gives 64 = k * 4², leading to k = 4. Thus, y = 4x².

(d) Substituting x = 3 into the expression y = 4x² gives y = 4 * 3² = 36.

(e) Solving y = 100 for x, we have 100 = 4x², which results in x = ±5.

The bar chart for the test results of 6 students in DFS Mathematics is not provided. However, it should display the names of the students on the x-axis and their corresponding marks on the y-axis, with bars representing the height of each student's mark.

(a) Expressing P (profit) in terms of n (number of phones sold), we can write P = c + kn, where c is the constant part of the profit and k is the rate of change.

(b) Substituting n = 40 into the expression P = c + kn and using the given information, we can calculate the profit.

(c) To find the number of phones sold if the target profit is $23,640, we can set P = 23,640 and solve for n using the given equation.

The first two questions involve solving equations. In the first question, we can solve for x by converting the logarithmic equation to an exponential form. By comparing the equation to 10^2 = x - 3, we can determine that x = 103. The second question asks us to identify the graph that represents y = log x, which is option C based on the given description.

The next set of questions involves simplifying algebraic expressions, solving equations, and working with direct variation. In question 7a, the expression 3a^2b^4 is already simplified. In question 7b, we solve the equation 2x - 1 = 64 and find x = 33. In question 8, we express y in terms of x and find the value of y for given values of x. In question 10, a bar chart is required to represent the test results of 6 students. Unfortunately, the specific details and data for the chart are not provided. In question 11, we express the profit P as a function of the number of phones sold, solve for profit values given a certain number of phones sold, and find the number of phones sold for a target profit.

Overall, the questions involve a mix of algebraic manipulations, problem-solving, and data representation.

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Given that g(a) = 2a − 1 and h(a) = 3a − 3 determine (g × h)(−4) 135 11 2 2 -21

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To find (g × h)(−4), we evaluate g(−4) = -9 and h(−4) = -15. Multiplying them gives (g × h)(−4) = 135.

To find the value of (g × h)(−4), we first need to evaluate g(−4) and h(−4), and then multiply the results.

Let's start by evaluating g(−4):

g(a) = 2a − 1

g(−4) = 2(-4) − 1

       = -8 - 1

       = -9

Next, we evaluate h(−4):

h(a) = 3a − 3

h(−4) = 3(-4) − 3

       = -12 - 3

       = -15

Finally, we multiply g(−4) and h(−4):

(g × h)(−4) = g(−4) × h(−4)

            = (-9) × (-15)

            = 135

Therefore, (g × h)(−4) equals 135.

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Using variation of parameters, find the particular solution of the differential equation x²y" - xy + y = 6x ln x, x > 0 if the solution to the auxiliary homogeneous d.e. is Yc = C₁x + c₂a ln(x). = Ур Enter your answer here

Answers

To find the particular solution of the differential equation x²y" - xy + y = 6x ln x using variation of parameters, we first need to find the Wronskian of the homogeneous solutions.

The homogeneous solutions are Yc = C₁x + C₂ ln(x), where C₁ and C₂ are constants. The Wronskian, denoted as W(x), is given by the determinant: W(x) = |x ln(x)|= |1 1/x |. Calculating the determinant, we get: W(x) = x(1/x) - ln(x)(1) = 1 - ln(x). Next, we find the particular solution using the variation of parameters formula: yp = -Y₁ ∫(Y₂ * g(x)) / W(x) dx + Y₂ ∫(Y₁ * g(x)) / W(x) dx. where Y₁ and Y₂ are the homogeneous solutions, and g(x) is the non-homogeneous term (6x ln x). Substituting the values, we have: yp = -(C₁x + C₂ ln(x)) ∫((C₁x + C₂ ln(x)) * 6x ln x) / (1 - ln(x)) dx + (C₁x + C₂ ln(x)) ∫(x * 6x ln x) / (1 - ln(x)) dx. Integrating these expressions will yield the particular solution. However, due to the complexity of the integrals involved, it is not possible to provide an exact expression in this format.

Therefore, the particular solution using variation of parameters is given by integrating the above expressions and simplifying.

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1) True or False: Consider a value of r = 0.500. It would be
appropriate to multiply this value by 100 and intepret it as
representing 50%.

Answers

Answer:

False

Step-by-step explanation:

r × 100

= 0.500 × 100

= 50

Convert the decimal to percentage by multiplying by 100.

50 = 5,000%

False (5,000% ≠ 50)

Solve the boundary value problem u = 2x, uz (0,y) = e, u(0, y) = ³.

Answers

To solve the boundary value problem with the given conditions u = 2x, uₓ(0,y) = e, and u(0, y) = ³, we can integrate the partial derivatives with respect to x and apply the given boundary conditions to determine the solution.

The given boundary value problem consists of the equation u = 2x and the boundary conditions uₓ(0, y) = e and u(0, y) = ³.

Integrating the equation u = 2x with respect to x, we get u = x² + C(y), where C(y) is the constant of integration with respect to y.

Differentiating u = x² + C(y) with respect to x, we obtain uₓ = 2x + C'(y), where C'(y) represents the derivative of C(y) with respect to y.

Applying the boundary condition uₓ(0, y) = e, we have 2(0) + C'(y) = e. Therefore, C'(y) = e.

Integrating C'(y) = e with respect to y, we find C(y) = ey + K, where K is the constant of integration with respect to y.

Substituting C(y) = ey + K back into the expression for u, we have u = x² + ey + K.

Applying the boundary condition u(0, y) = ³, we get 0² + ey + K = ³. Hence, ey + K = 3.

Solving for K, we have K = 3 - ey.

Substituting K = 3 - ey back into the expression for u, we obtain u = x² + ey + (3 - ey) = x² + 3.

Therefore, the solution to the boundary value problem is u = x² + 3.

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A vending machine at City Airport dispenses hot coffee, hot chocolate, or hot tea, in a constant service time of 20 seconds. Customers arrive at the vending machine at a mean rate of 60 per hour (Poisson distributed). Determine the operating characteristics of this system.
Which type of queuing problem is this?
a) Finite Population
b) Undefined Service Rate
c) Multi-Server
d) Finite Que
e) Constant Service Rate
f) Simple Single Server

Answers

The given problem involves Simple Single Server queuing model.In the given problem, a vending machine at City Airport dispenses hot coffee, hot chocolate, or hot tea, in a constant service time of 20 seconds. Customers arrive at the vending machine at a mean rate of 60 per hour (Poisson distributed).

The operating characteristics of this system can be determined by using the following formulas:Average Number of Customers in the System, L = λWwhere, λ= Average arrival rateW= Average waiting timeAverage Waiting Time in the System, W = L/ λProbability of Zero Customers in the System, P0 = 1 - λ/μwhere, μ= Service rateThe given problem can be solved as follows:Given that, λ = 60 per hourSo, the average arrival rate is λ = 60/hour. We know that the exponential distribution (which is a Poisson process) governs the time between arrivals. Therefore, the mean time between arrivals is 1/λ = 1/60 hours. Therefore, the rate of customer arrivals can be calculated as:μ = 1/20 secondsTherefore, the rate of service is μ = 3/hour.

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A binomial experiment has 10 trials with probability of success 0.8 on each trial. What is the probability of less than two successes?

Answers

The probability of less than two successes is approximately 0.0000082944.


To calculate the probability of less than two successes in a binomial experiment with 10 trials and a probability of success of 0.8 on each trial, we can use the binomial probability formula. The probability can be found by summing the probabilities of getting 0 and 1 success in the 10 trials.

In a binomial experiment, the probability of getting exactly x successes in n trials, where the probability of success on each trial is p, is given by the binomial probability formula:

P(x) = C(n, x) * p^x * (1 - p)^(n - x)

In this case, we want to find the probability of less than two successes, which means we need to calculate P(0) + P(1). Since we have 10 trials and a probability of success of 0.8, the calculations are as follows:

P(0) = C(10, 0) * 0.8^0 * (1 - 0.8)^(10 - 0)

    = 1 * 1 * 0.2^10

    = 0.2^10

P(1) = C(10, 1) * 0.8^1 * (1 - 0.8)^(10 - 1)

    = 10 * 0.8 * 0.2^9

    = 10 * 0.8 * 0.2^9

Finally, we add the probabilities:

P(less than two successes) = P(0) + P(1)

                          = 0.2^10 + 10 * 0.8 * 0.2^9

P(less than two successes) = 0.2^10 + 10 * 0.8 * 0.2^9

                          = 0.0000001024 + 10 * 0.8 * 0.000001024

                          = 0.0000001024 + 0.000008192

                          ≈ 0.0000082944

Therefore, the probability of less than two successes is approximately 0.0000082944.


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Dx + (D+2)y 9. For the system of differential equations (D-3)x 2y show all the steps to eliminate the x and find the solution for y. = 3] Monarch

Answers

To eliminate x in the system Dx + (D+2)y = 9 and (D-3)x + 2y = 3, multiply and subtract the equations to find x = 24 - 3D. Substituting into the first equation yields y = (3D^2 - 25D + 9)/(D+2).



To eliminate the variable x and find the solution for y in the system of differential equations Dx + (D+2)y = 9 and (D-3)x + 2y = 3, we can use the method of elimination.First, multiply the first equation by 2 and the second equation by (D+2) to make the coefficients of y in both equations equal:

2(Dx + (D+2)y) = 2(9)  => 2Dx + 2(D+2)y = 18   [Equation 1]

(D+2)((D-3)x + 2y) = (D+2)(3)  => (D+2)x - 2(D+2)y = 3(D+2)   [Equation 2]

Now, subtract Equation 2 from Equation 1 to eliminate y:

2Dx + 2(D+2)y - ((D+2)x - 2(D+2)y) = 18 - 3(D+2)

Simplifying the equation gives:

2Dx + 2(D+2)y - Dx - 2x + 2(D+2)y = 18 - 3D - 6

x = 24 - 3D

Substituting this value of x back into the first equation Dx + (D+2)y = 9, we can solve for y:D(24 - 3D) + (D+2)y = 9

24D - 3D^2 + (D+2)y = 9

-3D^2 + 25D + (D+2)y = 9

(D+2)y = 3D^2 - 25D + 9

y = (3D^2 - 25D + 9)/(D+2)

Therefore, the solution for y is y = (3D^2 - 25D + 9)/(D+2).

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Listed below are measured amounts of caffeine (mg per 12 oz of drink) obtained in one can from each of 20 brands (7-UP, A&W Root Beer, Cherry Coke, Tab, etc.).
0, 0, 34, 34, 34, 45, 41, 51, 55, 36, 47, 41, 0, 34, 53, 54, 38, 0, 41, 47
What important feature of the data is not revealed by any of the measures of center? Choose those that are most appropriate.
Group of answer choices
Skewness to one side
Multimodal feature in the data
Possible outliers
Depth of dispersion
All of the above.
None of the above.

Answers

The important feature of the data that is not revealed by any of the measures of center is the possibility of outliers. The correct answer is C.

Outliers are extreme values that are significantly different from the majority of the data. In this case, the values 0, 45, 51, 55, and 54 could potentially be outliers as they are noticeably different from the other values in the data set. Outliers can affect the measures of center, such as the mean, but they are not captured by the mean, median, or mode alone.

Therefore, the correct answer is "Possible outliers." The correct answer is C.

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A manufacturer of contact lenses is studying the curvature of the lenses it sells. In particular, the last 500 lenses sold had an average curvature of 0.5. The population is a. the 500 lenses. b. 0.5. c. the lenses sold today. d. all the lenses sold by the manufacturer. e. none of the above

Answers

The standard deviation of times taken for germination for cauliflower seeds is approximately 0.70 days.

To find the standard deviation of times taken for germination for cauliflower seeds, we can use the concept of the standard normal distribution.

Let's denote the standard deviation as σ.

Given that 90% of the cauliflower seeds germinate in 6.2 days or more, we can find the z-score corresponding to this percentile.

The z-score can be calculated using the formula:

z = (x - μ) / σ

where:

x = 6.2 (the value of interest)

μ = 7.1 (mean)

σ = standard deviation (to be determined)

To find the z-score, we can rearrange the formula as follows:

σ = (x - μ) / z

Substituting the given values:

σ = (6.2 - 7.1) / z

To find the z-score corresponding to the 90th percentile, we look up the value in the standard normal distribution table or use a calculator. The z-score for a cumulative probability of 0.9 is approximately 1.2816.

Substituting the z-score into the formula:

σ = (6.2 - 7.1) / 1.2816

Performing the calculation:

σ = -0.9 / 1.2816 ≈ -0.7020

Rounding the standard deviation to two decimal places, we get:

σ ≈ -0.70

Therefore, the standard deviation of times taken for germination for cauliflower seeds is approximately 0.70 days.

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The manufacturer of contact lenses is studying the curvature of the lenses it sells. In particular, the last 500 lenses sold had an average curvature of 0.5. In the context of statistical analysis, the population refers to all of the individuals, objects, measurements, or data points that have a common characteristic of interest to the researcher.

The population is usually denoted by "N." In this case, the population refers to all the lenses sold by the manufacturer.A sample is a subset of the population, and it is typically denoted by "n." A sample is used to draw inferences about the population. In this case, the sample is the last 500 lenses sold by the manufacturer. Therefore, the correct answer is (d) all the lenses sold by the manufacturer. The population in this context includes all the lenses sold by the manufacturer, not just the last 500 lenses. It is essential to understand the difference between population and sample, as it has important implications for statistical inference, generalizability of results, and accuracy of conclusions.

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In the following, convert an area from one normal distribution to an equivalent area for a different normal distribution. Show details of your calculation. Draw sketches of both normal distributions, find and label the endpoints, and shade the regions on both curves.
The area to the right of 50 in a N(40, 8) distribution converted to a standard normal distribution.

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The area to the right of 50 in an N(40, 8) distribution converted to a standard normal distribution is 0.1056.

Given data: μ = 40, σ = 8 and X = 50.To find: The area to the right of 50 in an N(40, 8) distribution converted to a standard normal distribution.

For a normal distribution N(μ, σ), the z-score is given by:z = (X - μ) / σPutting the given values in the above formula, we get:z = (50 - 40) / 8 = 1.25The equivalent area in the standard normal distribution can be found using the standard normal table as:

Area to the right of 1.25 in the standard normal distribution = 1 - Area to the left of 1.25 in the standard normal distribution.

Let us draw the two normal distributions to better understand the conversion: Normal Distribution N(40, 8)

Normal Distribution N(0, 1)

We need to find the area to the right of X = 50 in the N(40, 8) distribution. The shaded region is shown below:

Shaded region in N(40, 8) distributionNow, we need to find the equivalent area in N(0, 1) distribution.

For this, we need to find the area to the right of z = 1.25 in N(0, 1) distribution. The shaded region is shown below:

The shaded region in N(0, 1) distribution

So, the area to the right of 50 in an N(40, 8) distribution converted to a standard normal distribution is 0.1056 (approx).

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f(x)=x³−2x a) Find the average rate of change when x=4 and h=0.5 b) Find the average rate of change between x=4 and x=4.01 (You only need to do part a and b for #17 only.)

Answers

a) The average rate of change when x = 4 and h = 0.5 is -87.25.

b) The average rate of change between x = 4 and x = 4.01 is 1612.0301.

a) To find the average rate of change when x = 4 and h = 0.5 for the function f(x) = x³ - 2x, we can use the formula:

The average rate of change = (f(x + h) - f(x)) / h

Substituting the given values:

Average rate of change = (f(4 + 0.5) - f(4)) / 0.5

To calculate f(4 + 0.5) and f(4):

f(4 + 0.5) = (4 + 0.5)³ - 2(4 + 0.5) = 4.375

f(4) = 4³ - 2(4) = 48

Substituting these values into the formula:

The average rate of change = (4.375 - 48) / 0.5

The average rate of change = (-43.625) / 0.5

The average rate of change = -87.25

Therefore, the average rate of change when x = 4 and h = 0.5 for the function f(x) = x³ - 2x is -87.25.

b) To find the average rate of change between x = 4 and x = 4.01 for the function f(x) = x³ - 2x, we can use the same formula:

The average rate of change = (f(x₂) - f(x₁)) / (x₂ - x₁)

Substituting the given values:

The average rate of change = (f(4.01) - f(4)) / (4.01 - 4)

To calculate f(4.01) and f(4):

f(4.01) = (4.01)³ - 2(4.01) = 64.120301

f(4) = 4³ - 2(4) = 48

Substituting these values into the formula:

The average rate of change = (64.120301 - 48) / (4.01 - 4)

The average rate of change = 16.120301 / 0.01

The average rate of change = 1612.0301

Therefore, the average rate of change between x = 4 and x = 4.01 for the function f(x) = x³ - 2x is 1612.0301.

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As a result, utilising public-private partnerships (PPPs) for infrastructure development in the Malaysian public sector is critical in reducing the country's debt burden. According to the World Bank, Malaysia's average annual PPP investment from 2011 to 2015 was US$883 million, while in 2015, the investment was $2,675 million, a 203 percent increase (World Bank Group 2015). PPP agreements have enabled the development of toll motorways, ports, airports, flood tunnels, and government office buildings in Malaysia, among other things. Malaysia had completed 698 PPP projects as of December 2014 (Chief Secretary to the Government of Malaysia 2015) c) Discuss the TEN (10) projects in Malaysia that are part of a public-private partnership. x-(e-s (5 +53) 16 ) = u(t)e-3(1-1) cosh4t 2. (s+3)-16, Listed below are body temperatures from five different subjects measured at 8AM and again at 12AM. Find the values of d and sd. In general, what does d represent? Temperature (0F) at 8 AM : 97,9 98,9 97,4, 97,9, 97,8Temperature (0F) at 12 AM : 98,7, 99,4, 97,9, 97,8, 98,1Let the temperature at 8AM be the first sample, and the temperature at 12AM be the second sample. Find the values of d and sdd= (Type an integer or a decimal. Do not round.) sd= (Round to two decimal places as needed.) In general, what does d represent? A. The mean of the means of each matched pair from the population of matched data B. The mean value of the differences for the paired sample data C. The difference of the population means of the two populations D. The mean of the differences from the population of matched data Scenario: EXAMINATION CONTROLLER MANAGEMENT SYSTEM Examination Controller Management website with all kind of Exam details, Result related reports, seating details for Exam, date sheet for Mid-term exam, courses details and other resource related details too. It tracks all the details of a student result from the day one to the end of his course which can be used for all reporting purpose, making of attendance sheet for Examination, coming semester year Student and courses details, exam details, final exam result as well as mid-term exam result, and all these will be available for future references too. It is a web-based Examination Controller Management System incorporating HTML, CSS, JavaScript, Asp.net, SQL Server, Boot Strap and jQuery. This product is designed to be fully customizable. The development will be done by using Visual Studio, SQL Server and IIS (Internet Information Service). Major Milestones for this Project will be: Meeting and Discussion with supervisor Identifying High-Level Requirements Finalizing Requirements Completing Designing and Development Perform Testing Deliver Final Product Scope First system is filing based system so number of people is requiring managing all data and records. People need to go at college get any information relevant to Examination and result. This process is time consumption and difficult to manage it. So, examination controller is web- based site that provide all activities relevant to controller office and manage all record online easily. People can access data anywhere in the world and see information. The ultimate goal of Website should be providing an easy way for our controller examiner to complete the process online. This application is secure with admen panel. Question 1: Specify the functional and nun-functional requirements. = (a) Use eigenvalues of the Hessian matrix to classify the critical points for f(x, y) y 32y + x x as relative maxima, relative minima or saddle points. (5 marks) (b) Apply Lagrange multipliers to find the maximum and minimum values of f(x, y) = xy subject to the constraint 4x + y = 8, if such values exist. (5 marks) The Excel workbook named "Week 02 Data Set (Excel)" has the following variables for 53 cities in the United States:X1 = death rate per 1,000 residentsX2 = doctor availability per 100,000 residentsX3 = hospital availability per 100,000 residentsX4 = annual per capita income in thousands of dollarsX5 = population density people per square mileReference: Thomas, G. S. (1990). The Rating Guide to Life in America's Small Cities. Prometheus Books.Address the following in your submission:Perform multiple linear regression analysis to test the association between X1 (dependent variable) and the remaining variables. Interpret your model.Investigate collinearity and confounding and adjust your model accordingly. Interpret your new model.Conduct residual analysis for the new model.Additionally, include a one-paragraph summary of your findings.Please follow proper APA writing guidelines and include citations as needed.X1X2X3X4X58782849.11099.3684338.71447.5707397.21138.99617928.99710.2744778.32068.311136210.91248.877671101528.81686369.116210.7823298.715011.7896347.61348.514963110.82928.3602579.51088.2962848.81117.9836039.518210.31306868.71297.414534511.21589.611213579.71869.31315449.617710.6802059.11279.713012649.217911.61406888.3808.11543548.41039.811816329.41017.4943489.81179.411937010.48811.21536489.9789.11163669.210210.59754010.39511.91766808.9808.4753459.692513452510.31269.816187010.41089.81116699.77710.81144529.66010.114243010.77110.923882210.3869.27819010.7938.31968679.61067.312596910.51629.4824997.7959.412592510.2919.81293539.9523.6842888.41108.418371810.46910.81195409.25710.1180668131069823478.84010713459.25011.31184637.83511.31217288.28612.8683837.4571011231610.4576.71093888.994 The moderating effect of the financial literacy on the decision to use financial technologyelaborate the following :a) Performance expectancyb) Effort expectancyc) Financial technologyd) Behavioural intention How important is to assess the perception of each and everyemployee? Relate with an example of an organization and itspeople? From this introspection, giving examples identify two personal habits/routines, which have been enhancing or hindering your achievement or learning progress. (using no more than 120 words)