please explain and show all steps
а Assume X is normally distributed with a mean of 11 and a standard deviation of 3 Determine the value of x that solves P (X> x) = 0.8

Answers

Answer 1

We can conclude that if X is normally distributed with a mean of 11 and a standard deviation of 3, then the value of x that solves P(X > x) = 0.8 is x = 13.52.

We need to find the value of x such that P(X > x) = 0.8, where X is a normally distributed random variable with mean μ = 11 and standard deviation σ = 3.

From the properties of the standard normal distribution, we know that if Z is a standard normal random variable, then P(Z > z) = 0.8 corresponds to z = 0.84 (found using a standard normal table or calculator).

We can standardize X to a standard normal random variable Z using the formula:

Z = (X - μ) / σ

Substituting the values μ = 11 and σ = 3, we get:

Z = (X - 11) / 3

Now, we want to find the value of x such that P(X > x) = 0.8. We can rewrite this as:

P(Z > (x - 11) / 3) = 0.8

Using the standard normal table or calculator, we find that P(Z > 0.84) = 0.2005.

Therefore, we can write:

0.2005 = P(Z > 0.84) = P((X - 11) / 3 > 0.84) = P(X > 11 + 3(0.84)) = P(X > 13.52)

So the value of x that solves P(X > x) = 0.8 is x = 13.52.

Therefore, we can conclude that if X is normally distributed with a mean of 11 and a standard deviation of 3, then the value of x that solves P(X > x) = 0.8 is x = 13.52.

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Related Questions

Find the surface area of the solid formed by the net. Round your answer to the nearest hundredth.

Answers

The surface area of the solid formed by the net = 150.72 in²

From the figure we can observe that the solid formed by the net is the net of a cylinder.

The cylinder bases are the 2 circles and the curved surface of the cylinder is the rectangle.

The surface area of the cylinder = Area of the 2 circles + area of the rectangle

Here, the diameter of circle is 4 in

So, the radius of circle = ½ × 4

                                     = 2 in

So, the area of the 2 circles would be,

2(πr²)

= 2 × 3.14 × 2²

= 25.12 in²

Here the width of the rectangle is 10 in. and the length is nothing but the circumference of the circle.

so, length L =  πd

                   = π × 4

                   = 12.56 in

Now the area of rectangle would be,

L × W

= 12.56 × 10

= 125.6 in²

The total surface area of net would be,

Area of the 2 circles + area of the rectangle

= 25.12 + 125.6

= 150.72 in²

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Choose five other iterated integrals that are equal to the given iterated integral. 7 0 7 y y 2 2 y
∫ ∫ ∫ f(x, y, z) dz dx dy 0 y 0
∫ ___ ∫ ___ ∫ ___ f(x,y,z) dz dy dx
∫ ___ ∫ ___ ∫ ___ f(x,y,z) dx dz dy
∫ ___ ∫ ___ ∫ ___ f(x,y,z) dx dy dz
∫ ___ ∫ ___ ∫ ___ f(x,y,z) dy dz dx
∫ ___ ∫ ___ ∫ ___ f(x,y,z) dy dx dz

Answers

Five other iterated integrals that are equal to the given iterated integral are:

∫₀⁷ ∫y²₂ ∫₀ʸ f(x, y, z) dx dz dy

∫₀⁷ ∫₀ʸ ∫y²₂ f(x, y, z) dx dz dy

∫y²₂ ∫₀⁷ ∫₀ʸ f(x, y, z) dx dy dz

∫y²₂ ∫₀ʸ ∫₀⁷ f(x, y, z) dx dy dz

∫₀ʸ ∫y²₂ ∫₀⁷ f(x, y, z) dz dx dy

To find the five other iterated integrals that are equal to the given iterated integral, we need to rearrange the order of integration. We can do this by changing the order of the limits of integration and writing the integral with respect to a different variable first.

The original integral is:

∫₀⁷ ∫y²₂ ∫₀ʸ f(x, y, z) dz dx dy

Now, we can change the order of integration in the following ways:

∫₀⁷ ∫y²₂ ∫₀ʸ f(x, y, z) dx dz dy

∫₀⁷ ∫₀ʸ ∫y²₂ f(x, y, z) dx dz dy

∫y²₂ ∫₀⁷ ∫₀ʸ f(x, y, z) dx dy dz

∫y²₂ ∫₀ʸ ∫₀⁷ f(x, y, z) dx dy dz

∫₀ʸ ∫y²₂ ∫₀⁷ f(x, y, z) dz dx dy

Each of these integrals has the same value as the original integral, but with a different order of integration. It is important to note that changing the order of integration can sometimes make the integral easier to evaluate, especially if the integrand has certain symmetries.

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a businessman bought a personal computer for $10768,he incurred a loss of 21% on the cost price. find the selling price of the computer

Answers

The selling price of the computer was $8507.52.

We have,

If the businessman incurred a loss of 21% on the cost price, then the selling price (SP) must have been 79% of the cost price (CP), since:

SP = CP - Loss

SP = CP - 0.21 x CP

SP = 0.79 x CP

We know that the cost price was $10768, so we can substitute this value into the equation above to find the selling price:

SP = 0.79 x CP

SP = 0.79 x $10768

SP = $8507.52

Therefore,

The selling price of the computer was $8507.52.

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What value of x will make M the midpoint of PO if PM-3x-1 and PQ-5x+3?

Answers

The value of x that would make M the midpoint of PQ if PM = 3x-1 and PQ = 5x+3 include the following: 2.

How to determine the midpoint of a line segment?

In Mathematics, the midpoint of a line segment with two end points can be calculated by adding each end point on a line segment together and then divide by two (2).

Since M is the midpoint of line segment PO, we have the following:

Line segment PM = Line segment PQ

3x - 1 = 5x + 3

5x - 3x = 3 + 1

2x = 4

x = 4/2

x = 2

PM = 3x - 1 = 3(2) - 1 = 6 - 1 = 5 units.

PQ = 5x + 3 = 5(2) + 3 = 10 + 3 = 13 units.

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2. (10p) There are two points P1(1,2,2) and P2(-1,1,0) in Cartesian coordinate system. For position vectors R1 and R2, solve following problems. (1) Cross product of Ri and R2 (2) Inner angle between R1 and R2 (3) Area of a triangle OP1P2 (4) Circumference of the triangle OP.P2

Answers

1) the cross product of R1 and R2 is -4i + 2j + 3k.

2) the inner angle between R1 and R2 is given by:56.35 degrees

3) the area of the triangle OP1P2 is (1/2) sqrt(29).

4)the circumference of the triangle OP1P2 is: C

(1) Cross product of R1 and R2:

The cross product of two vectors R1 and R2 is given by:

R1 × R2 = (R1yR2z - R1zR2y)i - (R1xR2z - R1zR2x)j + (R1xR2y - R1yR2x)k

Substituting the values of R1 and R2, we get:

R1 × R2 = (2×0 - 2×1)i - (1×0 - (-1)×2)j + (1×1 - 2×(-1))k

= -4i + 2j + 3k

Therefore, the cross product of R1 and R2 is -4i + 2j + 3k.

(2) Inner angle between R1 and R2:

The inner angle between two vectors R1 and R2 is given by:

cos θ = (R1 · R2) / (|R1||R2|)

where R1 · R2 is the dot product of R1 and R2, and |R1| and |R2| are the magnitudes of R1 and R2, respectively.

Substituting the values of R1 and R2, we get:

R1 · R2 = 1×(-1) + 2×1 + 2×0 = -1 + 2 = 1

|R1| = sqrt(1^2 + 2^2 + 2^2) = sqrt(9) = 3

|R2| = sqrt((-1)^2 + 1^2 + 0^2) = sqrt(2)

Therefore, the inner angle between R1 and R2 is given by:

cos θ = 1 / (3sqrt(2))

θ = cos^(-1) (1 / (3sqrt(2)))

θ ≈ 56.35 degrees

(3) Area of a triangle OP1P2:

Let R = R2 - R1 be the vector connecting P1 to P2. Then the area of the triangle OP1P2 is given by:

A = (1/2) |R1 × R2|

= (1/2) |(-4i + 2j + 3k)|

= (1/2) sqrt((-4)^2 + 2^2 + 3^2)

= (1/2) sqrt(29)

Therefore, the area of the triangle OP1P2 is (1/2) sqrt(29).

(4) Circumference of the triangle OP1P2:

Let a, b, and c be the side lengths of the triangle OP1P2 opposite to the points O, P1, and P2, respectively. Then the circumference of the triangle is given by:

C = a + b + c

To find the length of side c, we can use the distance formula:

c = |R2 - R1| = sqrt((-1 - 1)^2 + (1 - 2)^2 + (0 - 2)^2) = sqrt(18)

To find the length of sides a and b, we can use the fact that the triangle isisosceles (since the angles at P1 and P2 are equal), so a = b:

a = b = |P1 - O| = sqrt(1^2 + 2^2 + 2^2) = sqrt(9) = 3

Therefore, the circumference of the triangle OP1P2 is:

C

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Help me please and thank you so much!!!

Answers

The volume of the figure is given as follows:

V = 132 ft³.

How to calculate the volume?

The volume of a triangular prism is given as half the multiplication of the dimensions of the triangle, as follows:

V = 0.5 x l x w x h.

The dimensions of the triangle in this problem are given as follows:

3 ft, 8 ft and 11 ft.

Hence the volume of the prism is given as follows:

V = 0.5 x 3 x 8 x 11

V = 132 ft³.

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Find the value of each missing variable.

Answers

Check the picture below.

imagine that the sensitivity for a covid-19 test was 0.7, the specificity was 0.85, and the unconditional probability of a patient having the disease was 0.04. if such a patient tests positive, which is closest to the probability that they have the disease? group of answer choices 0.09 0.16 0.7 0.85 0.94

Answers

The closest answer choice to the probability that a patient has the disease given a positive test result is 0.16.

To determine the probability that a patient has the disease given a positive test result, we need to use Bayes' theorem:

[tex]P_{(disease| positive test)} = P_{(positive test)} \times P_{(disease)} / P_{(positive test)}[/tex]

where,

[tex]P_{(disease |positive test)}[/tex] = probability of having the disease given a positive test result

[tex]P_{(positive test|disease)[/tex] = sensitivity = 0.7

[tex]P_{ (disease)[/tex]  = unconditional probability of having the disease = 0.04

[tex]P_{(positive test)} = probability of testing positive = (P_{(positive test |disease)}\times P_{(disease)}) + (P_{(positive test |no disease)}\times P_{(no disease)})[/tex]

To calculate P(positive test |no disease), we need to use the specificity of the test, which is:

[tex]P_{(negative test |no disease)}[/tex]  = specificity = 0.85

Therefore,

[tex]P_{(positive test |no disease)} = 1 - P_{(negative test |no disease)} = 1 - 0.85 = 0.15[/tex]

And,

[tex]P_{(positive test)} = (0.7 \times 0.04) + (0.15 \times 0.96) = 0.0676[/tex].

Now we can calculate the probability of having the disease given a positive test result as follows:

[tex]P_{(disease |positive test)} = 0.7 \times 0.04 / 0.0676 = 0.413.[/tex]

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Sami wants to find the measurements of the sides and angles of the parallelogram shown. Which tools can she use to find these measurements? Select all that apply.
A.
protractor

B.
scale

C.
ruler

D.
compass

Answers

In a case whereby Sami wants to find the measurements of the sides and angles of the parallelogram shown the tools she can use to find these measurements are;

A.protractorC.ruler

What is the function of the selected tool in making a parallelogram?

The protractor serves as one of the tools that can be used in making the parallelogram whih which be used in the mearement of the angles of the paralleolgram.

The ruler is also useful in the creation of the parallelogram because it can be used to meausre the lenght of the fiqure, hence the first as well as the third option is right

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The table gives the cost for renting a limousine from Grey’s Limousine Rental. Which equation represents the company's fare structure, based on the amount of time it is rented?

Answers

The equation that represents the company's fare structure, based on the amount of time it is rented is y = 60x + 120.

Option C is the correct answer.

We have,

From the table, we can make an equation.

Take two ordered pairs.

i.e

(1, 180) and (2, 240)

Now,

Let the equation be y = mx + c

So,

m = (240 - 180)/ (2 - 1) = 60/1 = 60

And,

(1, 180) = (x, y)

180 = 60 x 1 + c

180 = 60 + c

c = 180 - 60

c = 120

Now,

y = mx + c

y = 60x + 120

Thus,

The equation that represents the company's fare structure, based on the amount of time it is rented is y = 60x + 120.

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8 pounds is the same as how many kilograms?

Answers

Answer:

3.6 kilograms

Step-by-step explanation:

divide the mass value by 2.205

Select the correct answer. Consider functions h and k. What is the value of x when ?

Answers

If two functions are f(x) and k(x), then, The correct option is C.

A mapping demonstrates the pairings of the components. It displays the input and output values of a function, much like a flowchart would.  Every element of the domain is associated with exactly one element of the range in a function, which is a unique kind of relation. A mapping demonstrates the pairings of the components.

It displays the input and output values of a function, much like a flowchart would. The two parallel columns of a mapping diagram.

The calculation is as follows:

If two functions are f(x) and k(x),

(f o g)(x) = f[g(x)]

Now according to the picture

We have to find the value of (h o k)(1).

(h o k)(x) = h[k(x)]

             = h[k(1)]

             = h(3) [Since, k(1) = 3]

             = 28 [Since, h(3) = 28]

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Correct Question:

Select the correct answer. Consider functions h and k. What is the value of ?

Consider the following situation:
Recent data from Victoria show that only 53% of people who have died of COVID were unvaccinated. The remainder had one, two or three doses of a vaccine. Hence, the probability that a random person who died of COVID was fully unvaccinated is 0.53. The probability of a randomly chosen person in Victoria being vaccinated at least once is 0.93.
(a) Denote the probability of dying from COVID as P r(D). Now use Bayes' rule to calculate both the probability of dying conditional on being unvaccinated P r(D|U ) and the probability of dying conditional on being vaccinated P r(D|V ). Note that both conditional probabilities will be functions of P r(D), which is unknown. Comment on the relative likelihood of dying with and without vaccination.
(b) The almost equal fractions of vaccinated and unvaccinated deaths from COVID make lots of people believe that vaccinations are not effective. What type of error are these people committing? Explain!
(c) People who already believe that vaccinations are not effective often concentrate their attention on the death rates of the entirely unvaccinated. Somehow the strong evidence for the efficacy of the vaccine does not register. For example, the information that the fraction of deceased who have received three doses is only 1.7%, while about 53% of the population have received three doses, should persuade them but does not. Which bias is at work? Explain!

Answers

It is important to recognize and be aware of confirmation bias to engage in more unbiased and evidence-based thinking.

(a) To calculate the probability of dying from COVID conditional on being unvaccinated, Pr(D|U), using Bayes' rule, we can write:

Pr(D|U) = (Pr(U|D) * Pr(D)) / Pr(U)

Where:

Pr(D) is the probability of dying from COVID (unknown)

Pr(U|D) is the probability of being unvaccinated given that the person died from COVID (given as 0.53)

Pr(U) is the probability of being unvaccinated (unknown)

Similarly, to calculate the probability of dying from COVID conditional on being vaccinated, Pr(D|V), we can write:

Pr(D|V) = (Pr(V|D) * Pr(D)) / Pr(V)

Where:

Pr(V|D) is the probability of being vaccinated given that the person died from COVID (1 - Pr(U|D) = 1 - 0.53 = 0.47)

Pr(V) is the probability of being vaccinated at least once (given as 0.93)

The relative likelihood of dying with and without vaccination can be assessed by comparing Pr(D|U) and Pr(D|V). If Pr(D|U) is significantly higher than Pr(D|V), it suggests that being unvaccinated increases the likelihood of dying from COVID. If Pr(D|V) is close to or higher than Pr(D|U), it suggests that vaccination provides a protective effect against severe outcomes of COVID.

However, without knowing the value of Pr(D) (the overall probability of dying from COVID), we cannot make a specific comparison between Pr(D|U) and Pr(D|V). The calculation only provides conditional probabilities based on the given information.

To further analyze the relative likelihood, additional data or information on the overall probability of dying from COVID is needed.

(b) The type of error that people who believe vaccinations are not effective based on the almost equal fractions of vaccinated and unvaccinated deaths from COVID are committing is known as a "base rate fallacy."

The base rate fallacy occurs when individuals ignore or downplay the prior probabilities or base rates of events and focus solely on the conditional probabilities or specific outcomes. In this case, the base rate would be the overall vaccination rate in the population, which is not taken into account when comparing the fractions of vaccinated and unvaccinated deaths.

While it may be true that the fractions of vaccinated and unvaccinated deaths are similar, the base rate of vaccination in the population also needs to be considered. If a significant portion of the population is vaccinated, it is expected that there will be vaccinated individuals among the deaths, simply due to the larger number of vaccinated individuals.

To properly evaluate the effectiveness of vaccinations, it is important to compare the rates of COVID-related hospitalizations or deaths between vaccinated and unvaccinated individuals while taking into account the overall vaccination rate in the population. This broader analysis provides a more accurate assessment of the effectiveness of vaccines in preventing severe outcomes of COVID.

(c) The bias that is at work in this situation is known as "confirmation bias."

Confirmation bias refers to the tendency to selectively focus on or interpret information in a way that confirms pre-existing beliefs or hypotheses while ignoring or discounting evidence that contradicts those beliefs. In this case, individuals who already believe that vaccinations are not effective are exhibiting confirmation bias by concentrating their attention on the death rates of the entirely unvaccinated and disregarding the strong evidence for the efficacy of the vaccine.

Despite the information provided that only 1.7% of the deceased have received three doses of the vaccine while approximately 53% of the population has received three doses, individuals with confirmation bias tend to dismiss or downplay this evidence. They may actively seek out information or arguments that align with their preconceived notions while ignoring or dismissing information that challenges their beliefs.

Confirmation bias can hinder rational decision-making and prevent individuals from objectively evaluating new information or updating their beliefs based on the available evidence. It is important to recognize and be aware of confirmation bias to engage in more unbiased and evidence-based thinking.

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This week we are learning about setting a criteria for making a decision based on the evidence that is presented. Whenever we make a decision, there is a chance that we are wrong. Convention in Psychology is to accept a 5% risk of being wrong. Do you think that is too high of a risk to take? Why? What costs are there if we are to lower the risk to 1%?

Answers

A 5% risk of being wrong, as accepted by convention in psychology, is an acceptable level of risk as it balances decisions making and potential for error well. The costs of lowering the risk to 1% requires more time and efforts.

In my opinion, a 5% risk of being wrong is a generally acceptable level of risk in many situations in psychology. This is because it balances the need for making decisions with the potential for error.

If we were to lower the risk to 1%, it might require more time, resources, and effort to gather additional evidence and conduct more in-depth analysis. This could slow down the decision-making process, which might not be desirable in certain situations.

Ultimately, the acceptable level of risk depends on the context and the potential consequences of the decision being made. If the consequences of a wrong decision are severe, it may be worthwhile to invest in reducing the risk to 1% or lower.

However, for most everyday decisions, a 5% risk of being wrong is a reasonable compromise between accuracy and efficiency.

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It costs $1.12 to buy 7 gift tags. If the tags all cost the same amount, what is the price of each tag?

Answers

Each gift tag costs $0.16.

We have,

To solve this problem, we need to determine the price of each gift tag given that it costs $1.12 to buy 7 tags.

Let "x" be the price of each gift tag in dollars.

Then, if we buy 7 tags, the total cost would be 7 times the price of each tag:

7x

We know that this total cost is $1.12, so we can set up a proportion:

7x / 1 = 1.12 / 1

Simplifying, we get:

7x = 1.12

Now we can solve for "x" by dividing both sides by 7:

x = 1.12 / 7

Simplifying, we get:

x = 0.16

Therefore,

Each gift tag costs $0.16.

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An HR administrator wishes to know the proportion of employees that are currently using a very costly benefit to determine if it is still considered valuable by the staff. If the administrator has no preliminary notion of the proportion of employees using the benefit, how big a sample must she collect to be accurate within 0.09 at the 95% level of confidence?
Standard Normal Distribution Table
Round up to the next whole number

Answers

The HR administrator must collect a sample size of 108 employees to be accurate within 0.09 at the 95% confidence interval.

To determine the necessary sample size, we need to use the formula:

[tex]n = \frac{(z^2 )(p) (1-p)}{E^2}[/tex]

Where:
- n = sample size
- z = the z-score for the desired level of confidence (in this case, 1.96 for 95%)
- p = the estimated proportion of employees using the benefit (since we have no preliminary notion, we will use 0.5 as the most conservative estimate)
- E = the desired margin of error (0.09)

Plugging in these values, we get:

[tex]n = \frac{(1.96^2 )(0.5) (1-0.5)}{0.09^2}[/tex]
n = 107.92 = 108

We round up to the next whole number since we can't have a fraction of a person in our sample.

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b. Write and graph an inequality that represents the amount of sodium s in a serving that does not qualify as low sodium.

Inequality:

Answers

An inequality that represents the situation is s > 140.

Let's use "s" to represent the number of milligrams of sodium in a serving.

Since a serving of food does not qualify as low sodium if it contains more than 140 milligrams of sodium, we can write the inequality:

s > 140

This inequality reads "s is greater than 140", indicating that any value of "s" that is greater than 140 milligrams of sodium per serving does not qualify as low sodium.

To graph this inequality, we can represent "s" on the vertical axis and mark the value of 140 with a dashed line.

Since the inequality is greater than 140, we shade the area above the line to represent all the possible values of "s" that do not qualify as low sodium.

The resulting graph would look like given in the attached image.

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The complete question:

Write and graph an inequality that represents the number of sodium 's' in a serving that does not qualify as low sodium.

For a food to be labeled low sodium, there must be no more than 140 milligrams of sodium per serving.

A rich school has 48 players on the football team. The summary of the players' weight is even in the box plot. What is the median weight of the players 173 2016 240 TO 249 - 150 160 170 180 190 200 220 220 230 240 250 260 270 00 Wecht on pound Answer all Tables Keypad Keyboard Shortcuts pounds

Answers

The median weight of the players is 225 pounds.

To find the median weight of the players, we need to find the weight value that separates the 24th and 25th ordered weights. We can do this by looking at the box plot and determining the boundaries of the box, which contains the middle 50% of the data.

From the box plot, we can see that the box extends from 170 pounds to 250 pounds, so these are the weights that make up the middle 50% of the data. The median weight will be the weight that is in the middle of this range.

To find the median weight, we can take the average of the two middle values in this range. The two middle values are 220 and 230 pounds. So the median weight is:

(220 + 230) / 2 = 225 pounds

Therefore, the median weight of the players is 225 pounds.

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Instructor-created question Homework: Module 9- Hypothesis Testing for two Means (Depend HW Score: 62.68%, 23.19 of 37 points Points: 0 of 1 Save III A survey was conducted of two types of marketers. The first type being marketers that focus primarily on attracting business (B2B), and the second type being marketers that primanly target consumers (B2C) it was reported that 525 (90%) of B2B and 244 (59%) of B2C marketers commonly use a business social media tool. The study also revealed that 309 (53%) of B2B marketers and 241 (58%) of B2C marketers commonly use a video social media tool Suppose the survey was based on 584 B2B marketers and 417 B2C marketers Complete parts (8) tough (c) below a. At the 05 level of significance, is there evidence of a difference between B2Bmarkeders and B2C marketers in the proportion that commonly use the business social mediu tool? Let population 1 correspond to B2B marketers and population 2 correspond to B2C marketers. Choose the connect null and alternative hypotheses below OBH *** OAH 12 H *** H*** ODHO Ос. н. 1, а H, H, X2 Determine the test statistic Test Statistica Type an integer or a decimal Round to we decimal places as needed.) Find the rection region Select the conted choice below and in the answer boxes) to complete your choice (Round to three decimal places as needed OA2- 012 OBZ OC. + Determine a conclusion the ul hypothesis. There of a difference between 20 markets and B2C marketers in the proportion of the business social media tool b. Find the p value in (a) and interpret ils meaning p vake (Type an integer or a decimal Round to three decimal plans as needed Interpret the p valu of the proportion of B2B marketers that use the business social media tool the proportion of B2C marketers that use the business social media tool, the probability that a ZSTAT test statistic the one calculated is approximately equal to the p-value Al the 0.05 level of significance be there evidence of a diference between 28 marketers and B2C marketers in the proportion that use the video social media toor? Lut population correspond to B2B markets and population 2 correspond to B2C marketers Determine the testini Test Static Use 2 decimal places here Determine the p value p value (Type an integer or a deckenal Round to the decimal places as needed Determine a conclusion the null hypothesis. There of a difference between 28 marketers and B2C marketers in the proportion of the video social media tool

Answers

a. The null hypothesis is H0: p1 = p2, meaning that there is no difference in the proportion of B2B and B2C marketers who commonly use the business social media tool. The alternative hypothesis is Ha: p1 ≠ p2, indicating that there is a difference in the proportion of B2B and B2C marketers who commonly use the business social media tool.

To determine the test statistic, we can use the formula:

[tex]Z = (\frac{p1-p2}{\sqrt{p(1-p)} } (\frac{1}{n1} +\frac{1}{n2})[/tex]

where p is the pooled sample proportion, n1 and n2 are the sample sizes for B2B and B2C marketers, respectively.

Plugging in the values, we get:

[tex]p = \frac{(x1 + x2)}{(n1 + n2)} = \frac{525+244}{584+417} = 0.677[/tex]

[tex]Z= \frac{ (0.9 - 0.59)}{\sqrt{0.677(1-0.677)(\frac{1}{584}+\frac{1}{417}) } } } = 12.72[/tex]

The rejection region for a two-tailed test with alpha = 0.05 is ±1.96. Since our test statistic (12.72) is outside this range, we reject the null hypothesis and conclude that there is strong evidence of a difference in the proportion of B2B and B2C marketers who commonly use the business social media tool.

b. The p-value is the probability of observing a test statistic as extreme as the one calculated or more extreme, assuming the null hypothesis is true. We can find it using a Z-table or a calculator. Here, the p-value is essentially zero, indicating very strong evidence against the null hypothesis.

Interpreting the p-value, we can say that if the true proportion of B2B marketers who commonly use the business social media tool were equal to that of B2C marketers, the probability of observing a difference as extreme as the one in our sample or more extreme would be very small. Therefore, we can reject the null hypothesis and conclude that the proportion of B2B marketers who commonly use the business social media tool is significantly different from that of B2C marketers.

c. The null hypothesis is H0: p1 = p2, meaning that there is no difference in the proportion of B2B and B2C marketers who commonly use the video social media tool. The alternative hypothesis is Ha: p1 ≠ p2, indicating that there is a difference in the proportion of B2B and B2C marketers who commonly use the video social media tool.

To determine the test statistic, we can use the same formula as in part (a), but with the sample proportions and sizes for the video social media tool:

[tex]p = \frac{(x1 + x2)}{(n1 + n2)} = \frac{309+241}{584+417} = 0.444[/tex]

[tex]Z= \frac{ (0.53 - 0.58)}{\sqrt{0.444(1-0.444)(\frac{1}{584}+\frac{1}{417}) } } } = -1.33[/tex]

The p-value for a two-tailed test with alpha = 0.05 is approximately 0.18. Since this is greater than the significance level, we fail to reject the null hypothesis and conclude that there is not enough evidence to support a difference in the proportion of B2B and B2C marketers who commonly use the video social media tool.

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For this problem, any non-integer answers should be entered as fractions in simplest form.

Michelle is playing a game where she spins a spinner once and rolls a six-sided number cube. Then, she takes the sum of the two numbers to determine how many spaces to move on a game board.


Use the spinner and the fair, six-sided number cube, numbered 1 to 6, above to determine the probability of each event.
The probability that the sum will be less than 6 is .
The probability that the sum will be equal to 11 is .
The probability that the sum will be greater than 8 is .
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Answers

The probabilities of the three events are:

P(sum < 6) = 1/2

P(sum = 11) = 1/18

P(sum > 8) = 1/3

We have,

There are 6 possible outcomes for the spinner and 6 possible outcomes for the number cube, so there are 6 x 6 = 36 equally likely outcomes in total.

The sum will be less than 6 if Michelle rolls a 1, 2, or 3 on the number cube, regardless of the result of the spinner.

There are 3 possible outcomes for the number cube and 6 possible outcomes for the spinner, so there are 3 x 6 = 18 outcomes where the sum is less than 6.

Therefore, the probability that the sum will be less than 6 is:

= P(sum < 6)

= 18/36

= 1/2

The sum will be equal to 11 if Michelle rolls a 5 or 6 on the spinner and a 6 on the number cube. There are 2 possible outcomes for the spinner and 1 possible outcome for the number cube, so there are 2 x 1 = 2 outcomes where the sum is equal to 11.

Therefore, the probability that the sum will be equal to 11 is:

= P(sum = 11)

= 2/36

= 1/18

The sum will be greater than 8 if Michelle rolls a 3, 4, 5, or 6 on the spinner and a 4, 5, or 6 on the number cube.

There are 4 possible outcomes for the spinner and 3 possible outcomes for the number cube, so there are 4 x 3 = 12 outcomes where the sum is greater than 8.

Therefore, the probability that the sum will be greater than 8 is:

= P(sum > 8)

= 12/36

= 1/3

Therefore,

The probabilities of the three events are:

P(sum < 6) = 1/2

P(sum = 11) = 1/18

P(sum > 8) = 1/3

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Question 6 of 13
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2 tries left. Please try again.
Which transformations are displayed in the graph of g(x) = (x-1)-3 as it relates to the graph of the parent function? Select all that apply.

Answers

The translations to the parent function f(x) = x² to generate the function g(x) = (x - 1)² - 3 are given as follows:

Shift right one unit.Shift down three units.

What is a translation?

A translation happens when either a figure or a function is moved horizontally or vertically on the coordinate plane.

The four translation rules for functions are defined as follows:

Translation left a units: f(x + a).Translation right a units: f(x - a).Translation up a units: f(x) + a.Translation down a units: f(x) - a.

The changes to the parent function in this problem are given as follows:

g(x) = f(x - 1) = translation right one unit.g(x) = f(x - 1) - 3 = translation down three units.

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Find the exact value of the expressions (a) sec

sin−1 12
13

and (b) tan

sin−1 12
13

Answers

On solving this trigonometry, we find that (a) sec(sin⁻¹ [tex]\frac{12}{13}[/tex]) = [tex]\frac{13}{5}[/tex] and (b) tan(sin⁻¹ [tex]\frac{12}{13}[/tex]) = [tex]\frac{12}{5}[/tex]

(a) To find the exact value of sec(sin⁻¹ [tex]\frac{12}{13}[/tex]), we can use the fact that sec(x) = [tex]\frac{1}{cos}[/tex](x). Let's draw a right triangle with opposite side 12 and hypotenuse 13. Using the Pythagorean theorem, we can find the adjacent side:

a² + b² = c²

a² + 12² = 13²

a² = 169 - 144

a = √25

a = 5

So our triangle has sides of length 5, 12, and 13. Now we can find cos(sin⁻¹  [tex]\frac{12}{13}[/tex]) by looking at the adjacent/hypotenuse ratio in this triangle:

cos(sin⁻¹ [tex]\frac{12}{13}[/tex]) =  [tex]\frac{5}{13}[/tex]

Therefore, sec(sin⁻¹(12/13)) = 1/cos(sin⁻¹ [tex]\frac{12}{13}[/tex])

                                            = 1/[tex]\frac{5}{13}[/tex]

                                            = [tex]\frac{13}{5}[/tex].

So the exact value of sec(sin⁻¹ [tex]\frac{12}{13}[/tex]) is [tex]\frac{13}{5}[/tex].

(b) To find the exact value of tan(sin⁻¹ [tex]\frac{12}{13}[/tex]), we can use the fact that tan(x) = sin(x)/cos(x). Let's use the same right triangle as before.

Then sin(sin⁻¹ [tex]\frac{12}{13}[/tex])=  [tex]\frac{12}{13}[/tex] and cos  [tex]\frac{12}{13}[/tex]) = [tex]\frac{5}{13}[/tex]  , so

tan(sin⁻¹ [tex]\frac{12}{13}[/tex]) = sin(sin⁻¹ [tex]\frac{12}{13}[/tex])/cos(sin⁻¹[tex]\frac{12}{13}[/tex])

                        = [tex]\frac{12}{13}[/tex] / [tex]\frac{5}{3}[/tex]

                        = [tex]\frac{12}{5}[/tex]

So the exact value of tan(sin⁻¹ [tex]\frac{12}{13}[/tex]) is [tex]\frac{12}{5}[/tex].

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Solve the following equation for the variable given


Sole Y=mx+b for b

Answers

The solution for b is y-mx in the equation y=mx+b.

The given equation is y=mx+b

y equal r=to m times of x plus b

We need to solve for b in the equation

To solve we have to isolate b from the equation

Subtract mx from both sides

y-mx=b

Hence, the solution for b is y-mx in the equation y=mx+b.

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Find the exact values of x and y.​

Answers

The values of x and y are given as follows:

x = y = 5.

What is the Pythagorean Theorem?

The Pythagorean Theorem states that in a right-angled triangle, the square of the length of the hypotenuse (the longest side) is equal to the sum of the squares of the lengths of the other two sides.

The theorem is expressed as follows:

c² = a² + b².

In which:

c is the length of the hypotenuse.a and b are the lengths of the other two sides (the legs) of the right-angled triangle.

The diagonal length of the rectangle is the hypotenuse of a right triangle of sides 6 and 8, hence:

d² = 6² + 8²

d² = 100

d = 10.

The segments x and y are each half the length of the diagonal, and the two diagonals have the same length for a rectangle, hence:

x = y = 5.

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The following equation models the exponential decay of a population of 1,000 bacteria. About how many days will it take for the bacteria to decay to a population of 120?

1000e^ -.05t

A. 2.5 days
B. 4.2 days
C. 42.4 days
D. 88.5 days

Answers

Step-by-step explanation:

120 = 1000 e^(-.05t)

120/1000 = e^(-.05t)   take natural LN of both sides

-2.12 = - .05t

t = 42.4 days

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The cats in the nearby neighborhood are having a population boom with various size cats.
In a population where 30 percent of the population is found to be greater than 4.5 kilograms, what percent of the population is likely greater than 5 kilograms?
Thanks!

Answers


To find the percent of the population that is likely greater than 5 kilograms, we need to determine the relationship between the given information and the desired result. However, we do not have enough information to directly calculate the percentage of cats weighing more than 5 kilograms based on the given data.

It is essential to have more details, such as the distribution of weights or a specific correlation between the two weight ranges (greater than 4.5 kg and greater than 5 kg), to provide an accurate answer to your question.

In summary, with the current information available, we cannot determine the percent of the cat population that is likely greater than 5 kilograms.

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Let M = R and d: MXM → R be discrete metric, namely, d(x, y) = 0 if x = y and d(x, y) = 1 if x # y for x,y € M. Verify that (M,d) is metric space.

Answers

all four properties are satisfied, we can conclude that (M,d) is a metric space.

What is metric space?

In mathematics, a metric space is a set of objects called points, together with a function called the distance function or metric, that defines a notion of distance between any two points in the space. The metric satisfies certain conditions to ensure that it is a useful measure of the "distance" between points, such as being non-negative, symmetric, and satisfying the triangle inequality. Metric spaces are used to study properties of objects that can be thought of as having a notion of distance, such as Euclidean space, graphs, and networks.

Let's check each of these properties:

Non-negativity: This property holds since d(x, y) is defined to be 0 or 1, both of which are non-negative.

Identity of indiscernibles: This property also holds since d(x, y) is defined to be 0 if and only if x = y.

Symmetry: This property holds since d(x, y) = d(y, x) for any x, y in M.

Triangle inequality: For any x, y, z in M, there are three cases to consider:

If x = y or y = z, then d(x, y) + d(y, z) = d(x, z) = 1 by definition, and the inequality holds.

If x = z, then both sides of the inequality are 0.

If x, y, and z are all distinct, then d(x, y) + d(y, z) = 2 and d(x, z) = 1, so the inequality holds.

Since all four properties are satisfied, we can conclude that (M,d) is a metric space.

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what expression is equivalent to
1/5(n+45)

Answers

The equivalent expression of the fraction 1/{5(n+45)} as,

1/{5(n+45)} = 1/ (5n + 225)

Equivalent expression of 1/{5(n+45)} can be expressed as,

By applying distributive property of addition in the denominator of the given fraction 1/{5(n+45)} , we get

5(n + 45) = 5·n + 5·45

⇒ 5(n + 45) = 5n + 225

The numerator of fraction 1/{5(n+45)} can be written in equivalent expression as,

1 = 1·1 = 1

Thus, we can write the equivalent expression of the fraction 1/{5(n+45)} as,

1/{5(n+45)} = 1/ (5n + 225)

Equivalent expressions are defined as expressions which work in same way even though they look different from each other.

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An employee is 25 years old and starting a 401k plan. The employee is going to invest $150 each month. The account is expected to earn 5.5% interest, compounded monthly. What is the account balance, rounded to the nearest dollar, after two years? a. $3,976 b. $3,796c. $6,675 d. $6,765

Answers

Rounding to the nearest dollar, we get an account balance of $3,796. Therefore, the answer is (b) $3,796. Option b is Correct.

A financial repository's account balance represents the amount of money there is at the end of the current accounting period. It is the sum of the balance carried over from the previous month and the net difference between the credits and debits that have been recorded during any particular accounting cycle.

The future value of an annuity with monthly contributions:

FV = [tex]P * ((1 + r/12)^{n - 1}) / (r/12)[/tex]

Here FV is the future value, P is the monthly payment, r is the annual interest rate, and n is the number of months.

In this case, P = $150, r = 5.5%, and n = 24 months (2 years * 12 months/year). Plugging in these values, we get:

FV =[tex]150 * ((1 + 0.055/12)^24 - 1) / (0.055/12)[/tex]

≈ $3,795.88

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The height, h, of a falling object t seconds after it is dropped from a platform 400 feet above
the ground is modeled by the function h (t) = 400 - 16x². What is the average rate at
which the object falls during the first 3 seconds?
O 64
O 48
O-64
O-48

Answers

The average rate at which the object falls during the first 3 seconds is given as follows:

-48.

How to obtain the average rate of change?

The average rate of change of a function is given by the change in the output of the function divided by the change in the input of the function.

The function for this problem is defined as follows:

h(x) = 400 - 16x².

The numeric values are given as follows:

h(0) = 400 - 16(0)² = 400.h(3) = 400 - 16(3)² = 256.

Thus the average rate of change is obtained as follows:

r = (256 - 400)/(3 - 0)

r = -48.

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