If we are testing for the difference between two population means and assume that the two populations have equal and unknown standard deviations, the degrees of freedom are computed as (n1)(n2) - 1.
True or False

Answer: your mum has all the answers just ask her kidding if i am correct its 29

Answer:

B. Negative

Step-by-step explanation:

Slope = rise/run or (y2 - y1) / (x2 - x1)

Pick 2 points (0, -2) (-2, -1)

We see the y increase by 1 and the x decrease by 2, so the slope is

m = -1/2

So, the answer is B. Negative

Answer: An obtuse angle is an angle that measures between 90 and 180 degrees. An obtuse angle is wider than a right angle but narrower than a straight angle.

Step-by-step explanation:

Answer:

Obtuse angle is any angle greater than 90°: Straight angle is an angle measured equal to 180°: Zero angle is an angle measured equal to 0°: Complementary angles are angles whose measures have a sum equal to 90°: Supplementary angles are angles whose measures have a sum equal to 180°.

There is no guarantee that any particular interval will contain the true population proportion.

a. To construct a 90% confidence interval for the proportion of all caterpillars that eventually become butterflies, we can use the following formula:

CI = P ± z*sqrt(P(1-P)/n)

where P is the sample proportion (53/361 = 0.1468), z is the critical value from the standard normal distribution for a 90% confidence level (z = 1.645), and n is the sample size (361).

Substituting these values into the formula, we get:

CI = 0.1468 ± 1.645sqrt(0.1468(1-0.1468)/361)

CI = (0.1073, 0.1863)

Therefore, with 90% confidence, the proportion of all caterpillars that eventually become butterflies is between 0.1073 and 0.1863.

b. If many groups of 361 randomly selected caterpillars were observed, then a different confidence interval would be produced from each group. About 90% of these intervals will contain the true population proportion of caterpillars that become butterflies, and about 10% will not contain the true population proportion. This is because the confidence level of 90% means that, in the long run, 90% of all intervals constructed using this method will contain the true population proportion. However, there is no guarantee that any particular interval will contain the true population proportion.

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The correct mean adjusts in the records for all 230 children is  96 pounds

The given issue includes finding the right cruel weight of the 230 children after adjusting for the scale blunder. The first mean weight is given as 98 pounds, but we got to alter for the scale blunder of 2 pounds that the scale was perusing over the genuine weight.

To correct the scale mistake, we ought to subtract 2 pounds from each child's recorded weight. This will shift the complete conveyance of weights by 2 pounds to the cleared out, so the unused cruel weight will be lower than the first cruel weight.

The first cruel weight is given as 98 pounds, but we got to alter for the scale blunder:

Rectified mean weight = Original cruel weight - Scale blunder

Rectified mean weight = 98 - 2

Rectified mean weight = 96 pounds

Subsequently, the proper cruel weight of the children after altering the scale blunder is 96 pounds. This implies that on normal, the children weighed 96 pounds rather than 98 pounds as initially recorded. 

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The pages that are filled with stamps ​are 252

From the question, we have the following parameters that can be used in our computation:

Stamps = 900

Empty = 72%

Using the above as a guide, we have the following:

Filled = (1 - Empty) * Stamps

So, we have

Filled = (1 - 72%) * 900

Evaluate

Filled = 252

Hence, 252 are filled

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Given that event A is known to occur and both events A and B have nonzero probabilities, we can conclude that the probability of event B occurring is zero. So, the correct answer to your question is: d. zero

If events A and B are mutually exclusive, it means that they cannot occur at the same time. So, if we know that event A has occurred, we can safely say that event B cannot occur. Therefore, the probability of the occurrence of event B given that event A has occurred is zero. Therefore, the correct answer is d) zero.

Mutually exclusive events are a fundamental concept in probability theory. It means that the occurrence of one event excludes the occurrence of another event. For example, when flipping a coin, the event of getting heads is mutually exclusive with the event of getting tails. It is impossible to get both heads and tails at the same time.

Understanding mutually exclusive events is important because it helps us to calculate the probability of combined events. For mutually exclusive events, we can simply add their probabilities to get the probability of their union. However, if events are not mutually exclusive, we need to subtract the probability of their intersection to avoid counting the same outcome twice.

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The surface area is 2302.8 sq. ft.

The surface area of a given object implies the sum or total area of all its individual surfaces.

In the given question, the object has trapezoidal and rectangular surfaces. So that;

i. area of the trapezoidal surface = 1/2(a + b)h

                                      = 1/2 (10 + 34) 24.7

                                      = 1/2(44)24.7

                                      = 22*24.7

                                      = 543.4

area of the trapezoidal surface is 543.4 sq. ft.

ii. area of rectangular surface 1 = length x width

                                              = 10 x 19

                                              = 190 sq. ft.

iii. area of rectangular surface 2 = length x width

                                                   = 19 x 27

                                                   = 513

The surface area of the object = (2*543.4) + 190 + (2*513)

                                                   = 2302.8

The surface area of the object is 2302.8 sq. ft.

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To find the proportion of tiles produced with a surface area less than 16.0 square inches, we'll use the properties of the normal distribution. Here are the steps:

1. Identify the given information: mean (μ) = 16.1 square inches, standard deviation (σ) = 0.2 square inches, and the desired surface area (x) = 16.0 square inches.

2. Calculate the z-score using the formula: z = (x - μ) / σ
  z = (16.0 - 16.1) / 0.2
  z = (-0.1) / 0.2
  z = -0.5

3. Look up the z-score (-0.5) in a standard normal distribution table or use a calculator to find the area to the left of the z-score. This area represents the proportion of tiles with a surface area less than 16.0 square inches.

4. The area to the left of z = -0.5 is approximately 0.3085.

So, the proportion of tiles produced with a surface area less than 16.0 square inches is approximately 0.3085, or 30.85%.

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The signal g(t) that is perpendicular to both f_1(t) = t and f_2(t) = t² is:

g(t) = (-4π²/3)cos(2t) + (36/π²)sin(3t) - (18/5)

What is trigonometry?

Trigonometry is a branch of mathematics that deals with the relationships between the sides and angles of triangles. It focuses on the study of trigonometric functions, which are functions that relate the angles of a triangle to the ratios of the lengths of its sides.

To make the signal g(t) perpendicular to both f_1(t) = t and f_2(t) = t², we need to find numbers a, b, and c such that the inner products of g(t) with both f_1(t) and f_2(t) are zero.

Let's start by finding the inner product of g(t) with f_1(t):

⟨g(t), f_1(t)⟩ = ∫₀¹ g(t) f_1(t) dt

= ∫₀¹ (a cos(2t) + b sin(3t) + c) t dt

= a/2 ∫₀¹ 2t cos(2t) dt + b/3 ∫₀¹ 3t sin(3t) dt + c/2 ∫₀¹ t dt

Using integration by parts for the first integral and evaluating the integrals, we get:

⟨g(t), f_1(t)⟩ = a/2 + b/9 + c/2

Similarly, we can find the inner product of g(t) with f_2(t):

⟨g(t), f_2(t)⟩ = ∫₀¹ g(t) f_2(t) dt

= ∫₀¹ (a cos(2t) + b sin(3t) + c) t² dt

= a/4 ∫₀¹ 2t² cos(2t) dt + b/9 ∫₀¹ 3t² sin(3t) dt + c/3 ∫₀¹ t² dt

Again, using integration by parts for the first integral and evaluating the integrals, we get:

⟨g(t), f_2(t)⟩ = a/2π² + b/27π² + c/3

To make g(t) perpendicular to both f_1(t) and f_2(t), we need to set both inner products to zero:

a/2 + b/9 + c/2 = 0

a/2π² + b/27π² + c/3 = 0

Solving this system of equations, we get:

a = -4π²/3

b = 36/π²

c = -18/5

Therefore, the signal g(t) that is perpendicular to both f_1(t) = t and f_2(t) = t² is:

g(t) = (-4π²/3)cos(2t) + (36/π²)sin(3t) - (18/5)

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Thus, [tex]$1,5$[/tex] are linearly independent over [tex]$\mathbb{Q}$[/tex], which implies that [tex]$\mathbb{Q}(5) = \mathbb{Q}[5]$[/tex].

(a) Since [tex]$5 = e^{2i/3}$[/tex], we have [tex]$5^3 = e^{2i} = 1$[/tex]. Thus, [tex]$5$[/tex] is a root of the polynomial [tex]$p(x) = x^3 - 1$[/tex]. Moreover, [tex]$p(5) = 5^3 - 1 = 124 \neq 0$[/tex], which implies that $p(x)$ is the minimal polynomial of [tex]$5$[/tex] over [tex]$\mathbb{Q}$[/tex]. Therefore, [tex]${1, 5, 5^2}$[/tex] is a basis for [tex]$\mathbb{Q}[5]$[/tex] as a vector space over [tex]$\mathbb{Q}$[/tex]. Any element of [tex]$\mathbb{Q}[5]$[/tex] can be written in the form [tex]$a+ b5 + c5^2$[/tex] for some [tex]$a,b,c \in \mathbb{Q}$[/tex]. Thus, [tex]$Q[S] = {a+b5|a,b \in Q}$[/tex].

(b) Let [tex]$a+b5, c+d5 \in \mathbb{Q}(5)$[/tex]. Then, [tex]$(a+b5)+(c+d5) = (a+c) + (b+d)5 \in \mathbb{Q}(5)$[/tex] and [tex]$(a+b5)(c+d5) = ac + (ad+bc)5 + bd5^2 = (ac-bd) + (ad+bc)5 \in \mathbb{Q}(5)$[/tex]. Therefore, [tex]$\mathbb{Q}(5)$[/tex] is a subfield of [tex]$\mathbb{C}$[/tex] containing [tex]$\mathbb{Q}$[/tex]. To show that [tex]$\mathbb{Q}(5) = \mathbb{Q}[5]$[/tex], it suffices to show that [tex]$1,5$[/tex] are linearly independent over [tex]$\mathbb{Q}$[/tex].

Suppose [tex]$a+ b5 = 0$[/tex] for some[tex]$a,b \in \mathbb{Q}$[/tex], not both zero. Then, [tex]$b \neq 0$[/tex] and we have [tex]$5 = -a/b \in \mathbb{Q}$[/tex], a contradiction. Thus, [tex]$1,5$[/tex] are linearly independent over [tex]$\mathbb{Q}$[/tex], which implies that [tex]$\mathbb{Q}(5) = \mathbb{Q}[5]$[/tex].

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The equation that can be used to calculate Willy the whale's position relative to sea level.

Question Blank 1 of 4; -245, Question Blank 2 of 4; -83, Question Blank 3 of 4; +103, Question Blank 4 of 4; -225

The sea level is the level of the sea, which is taken as the zero mark on the number line.

The level of Willy the whale below sea level = 245 feet

The level Willy the whale descends = 83 feet

The level wheely the whale ascends = 103 feet

Therefore, the level to which Willy the whale starts = -245 feet

The level Willy the whale descends to = (-245 - 83) feet = -328 feet

The level to which Willy the whale then ascends to = -328 feet + 103 feet = -225 feet

The equation to calculate the position of Willy the whale is therefore;

-245 - 83 + 103 = -225

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Answer:

Point form:

(1,-4)

Equation form:

x=1,y=-4

Step-by-step explanation:

Answer:

Step-by-step explanation:

The solution to the system of equations by substitution is x = 1 and y = -4.

To solve the system of equations by substitution, we can substitute the expression for y from the first equation (-4x) into the second equation (y = x - 5), resulting in -4x = x - 5. By rearranging the equation and solving for x, we get x = 1. Substituting this value back into the first equation, we find y = -4.

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The required equation of the circle with center (3, 5) and radius 8 is

(x - 3)² + (y - 5)² = 64.

Therefore option C is correct.

The circle is described as the locus of a point whose distance from a fixed point is constant with center (h, k).

The equation of the circle is shown as :

(x - h)² + (y - k)² = r²

where h, k = coordinate of the center of the circle on the coordinate plane

r =  radius of the circle.

With reference from the graph

the center of the circle is (3, 5) and radius of the circle is 8

we then can write  the equation of the circle as,

(x - h)² + (y - k)² = r²

(x - 3)² + (y - 5)² = 8²

(x - 3)² + (y - 5)² = 64

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The complete question is attached as an image.

The number of textbooks of each type sold is found by solving the system of equations and got as,

Number of chemistry textbooks = 210

Number of history textbooks = 158

Given that,

A textbook store sold a combined total of 368 chemistry and history textbooks in a week.

let c be the number of chemistry textbooks sold and h be the number of history textbooks sold.

c + h = 368

The number of history textbooks sold was 52 less than the number of chemistry textbooks sold.

h = c - 52

Substituting the second equation in first,

c + (c - 52) = 368

2c = 420

c = 210

h = 210 - 52 = 158

Hence the number of each textbooks is 210 and 158.

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The limit comparison test, we can conclude that the series Σ(n/√(n²+1)) also converges.

(a) To determine if the series Σ(5n/2n³ + n² + 1) from n=1 to infinity diverges, we can use the nth term test for divergence.

The nth term test for divergence states that if the limit of the nth term of a series as n approaches infinity is not zero, then the series diverges.

Let's evaluate the limit of the nth term of our series:

lim (n → ∞) (5n/2n³ + n² + 1)

As n approaches infinity, the term 5n/2n³ becomes 0 because the exponential term in the denominator grows much faster than the numerator. However, the terms n² and 1 remain constant.

Therefore, the limit of the nth term is 0.

Since the limit of the nth term is 0, the nth term test for divergence does not provide conclusive evidence, and we cannot determine whether the series converges or diverges.

(b) To compare the series Σ(5n/2n³ + n² + 1) from n=1 to infinity with the harmonic series, we need to show that it diverges by the comparison test.

The comparison test states that if 0 ≤ aₙ ≤ bₙ for all n, and the series Σbₙ diverges, then the series Σaₙ also diverges.

Let's compare the given series with the harmonic series Σ(1/n) from n=1 to infinity:

0 ≤ 5n/2n³ + n² + 1 ≤ 5n/2n³ + n² + n²

Simplifying the inequality:

0 ≤ 5n/2n³ + n² + 1 ≤ 5/2n + 2

Now, let's consider the harmonic series Σ(1/n):

The harmonic series Σ(1/n) is a well-known divergent series. It can be proven that Σ(1/n) diverges.

By comparison, since we have shown that 0 ≤ 5n/2n³ + n² + 1 ≤ 5/2n + 2, and the harmonic series diverges, we can conclude that the series Σ(5n/2n³ + n² + 1) also diverges by the comparison test.

Therefore, both (a) and (b) conclude that the series Σ(5n/2n³ + n² + 1) from n=1 to infinity diverges.

To determine the convergence of the series Σ(n/√(n²+1)) from n=1 to infinity, we can use the limit comparison test.

Let's consider the series Σ(1/√n) from n=1 to infinity, which is a well-known series with known convergence.

First, we need to check if the terms of the series Σ(n/√(n²+1)) are positive for all n. Since both n and √(n²+1) are positive for positive values of n, the terms n/√(n²+1) are also positive.

Now, let's evaluate the limit of the ratio of the nth term of the given series and the corresponding term of the series Σ(1/√n):

lim (n → ∞) (n/√(n²+1)) / (1/√n)

= lim (n → ∞) (n/√(n²+1)) * (√n/1)

= lim (n → ∞) √(n³)/(√(n²+1))

= lim (n → ∞) √(n)

As n approaches infinity, the limit √(n) also approaches infinity.

Since the limit of the ratio is not a finite positive value, but instead approaches infinity, the series Σ(n/√(n²+1)) and the series Σ(1/√n) have the same convergence behavior.

The series Σ(1/√n) is a harmonic series with a known convergence. It can be shown that Σ(1/√n) converges.

Therefore, by the limit comparison test, we can conclude that the series Σ(n/√(n²+1)) also converges.

In summary, the series Σ(n/√(n²+1)) from n=1 to infinity converges.

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The probability that the point lies on the square is P = 0.498

to find that probability, we need to take the quotient between the area of the square and the area of the circle.

We can see that the square has a side length of 5 units, then its area is.

A = 5*5 = 25 square units.

The circle has a radius of 4 units, then its area is:

A' = 3.14*4^2 = 50.24 square units

Then the probability is:

P = 25/50.24 = 0.498

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Answer:

0.0

Step-by-step explanation:

0.019 or 0.0

The solution to the equation  5 + 3x -7x(x+8) = 9-x is -20

First, simplify

5 + 3x - 7x - 56 = 9-x

Simplifying further:

-4x - 51 = 9-x

-4x - 51 + x = 9

-3x - 51 = 9

-3x = 60

x  = 60/-3

x = -20

based on the above, we can state that the solution the equation is -20

Note that an equation is a mathematical statement that includes the sign 'equal to' between two expressions with equal values. For instance, 3x + 5 equals 15. There are several sorts of equations, such as linear, quadratic, cubic, and so on.

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The index form is simplified to give 3m/2n

It is important to note that the index forms are models that are used for the representation of variables or numbers that too small or large in more convenient forms.

Some of the rules of index forms are;

From the information given, we have that;

3m³/ n -²• 2m -² n³

Add the like exponents of the denominator

3m³/2m² n³⁻²

add the values

3m³/2m⁻²n¹

Now, subtract the exponents

3/2 n⁻¹ m¹

Then, we have;

3m/2n

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If total of 180 of these shapes with be strung on the necklace, the necklace contains 30 squares, 30 circles, and 30 triangles.

The sequence of shapes in the necklace follows a pattern of increasing the number of shapes in each group by one, starting with one shape of each type in the first group. This means that the necklace will contain 1+2+3=6 shapes in each group, and there are a total of 180 shapes.

To find the number of each shape in the necklace, we need to determine the number of groups in the necklace. Since there are 6 shapes in each group, we can divide the total number of shapes by 6 to get the number of groups:

180 shapes ÷ 6 shapes/group = 30 groups

This means that there are 30 groups of shapes in the necklace. Within each group, there is one square, one circle, and one triangle. Therefore, the total number of each shape in the necklace is:

1 square/group × 30 groups = 30 squares

1 circle/group × 30 groups = 30 circles

1 triangle/group × 30 groups = 30 triangles

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The mean number of people in passenger cars on the highway is 1.7.

The mean is a measure of central tendency that represents the average value of a set of data. In the context of probability distributions, the mean is also referred to as the expected value. It is calculated by multiplying each possible value of the random variable by its probability of occurrence and summing up the products

To find the mean number of people in passenger cars on the highway, we need to multiply each possible number of people by its corresponding probability, and then add up these products.

So,

mean = (1 * 0.56) + (2 * 0.28) + (3 * 0.08) + (4 * 0.06) + (5 * 0.02)

mean = 0.56 + 0.56 + 0.24 + 0.24 + 0.1

mean = 1.7

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The equation which can be used to determine the total amount, t, Frankie will have spent after m months on his cell phone plan is t = 30 + 45m.

Given that,

Frankie has a new cell phone plan.

He will pay a one-time activation fee of 30$, and 45$ each month.

One time activation fee = $30

Amount each month = $45

Amount for m months = 45m

Total amount for the plan = 30 + 45m

If t represents the total amount for the cell phone activation plan, the required equation can be written as,

t = 30 + 45m

Hence the required equation for the cell phone plan is t = 30 + 45m.

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The 9th term of this geometric sequence 10, 40, 250, 1250, ....​ include the following: 655,360.

In Mathematics, the nth term of a geometric sequence can be calculated by using this mathematical equation (formula):

aₙ = a₁rⁿ⁻¹

Where:

Next, we would determine the common ratio as follows;

Common ratio, r = a₂/a₁

Common ratio, r = 40/10

Common ratio, r = 4

For the 9th term, we have:

a₉ = 10(4)⁹⁻¹

a₉ = 655,360.

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When you are given an equation for a function, it is important to know whether the function is increasing or decreasing. A function is said to be increasing if the value of the function increases as the input increases. Conversely, a function is said to be decreasing if the value of the function decreases as the input increases.

To determine whether a function is increasing or decreasing, you need to look at the sign of its first derivative. The first derivative of a function is the rate of change of the function with respect to its input. If the first derivative is positive, the function is increasing, and if it is negative, the function is decreasing. If the first derivative is zero, the function may have a local maximum or a local minimum.

To explain this in more detail, let's take the example of the function f(x) = x^2. To find the first derivative of this function, we need to differentiate it with respect to x. This gives us f'(x) = 2x. We can see that f'(x) is positive for x > 0, which means that the function f(x) = x^2 is increasing for x > 0. Similarly, f'(x) is negative for x < 0, which means that the function f(x) = x^2 is decreasing for x < 0.

In summary, to determine where a function is increasing or decreasing, you need to look at the sign of its first derivative. If the first derivative is positive, the function is increasing, and if it is negative, the function is decreasing. If the first derivative is zero, the function may have a local maximum or a local minimum.

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The linear equation that models the cab fare is: f(5) = 1.5(5) + 4 = 11.5 dollars

An equation is said to be linear if the maximum power of the variable is consistently 1. Another name for it is a one-degree equation. A linear equation with one variable has the conventional form Ax + B = 0. In this case, the variables x and A are variables, whereas B is a constant.

The equation for a linear equation in one variable is written as ax+b = 0, where a and b are two integers, and x is a variable. This equation has just one solution. For instance, the linear equation 2x+3=8 only has one variable. As a result, this equation has a single solution, x = 5/2.

Here f(x) = 1.5x + 4

where x is the number of miles.

To find the total fare for a 2-mile trip:

f(2) = 1.5(2) + 4 = 7 dollars

To find the total fare for a 3-mile trip:

f(3) = 1.5(3) + 4 = 7.5 dollars

To find the total fare for a 5-mile trip:

f(5) = 1.5(5) + 4 = 11.5 dollars

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The symbol ∪ represents the "union of events" in the context of probability and set theory.

The symbol ∪ indicates the union of events. This option corresponds to choice (d) in your given list. The union of events refers to the occurrence of at least one of the events in question. In other words, it combines the outcomes of two or more events into a single set, without any repetitions. This concept is essential in understanding probability theory, as it helps to analyze the likelihood of different events happening together or separately.

This means that it represents the set of all outcomes that belong to either one or both of the events being considered. For example, if event A represents rolling an even number on a die and event B represents rolling a number greater than 4, then the union of events A and B would be the set of outcomes {2, 4, 5, 6}. It is important to note that the union of events is different from the intersection of events, which represents the set of outcomes that belong to both events being considered. The sample space, on the other hand, represents the set of all possible outcomes of an experiment. Finally, the symbol ∑ represents the sum of probabilities of events, not the symbol ∪.

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