Conduct the appropriate test of significance (z score or student’s t/t test) for a research
situation. You should be able to read a scenario and identify the test you need to conduct
as well as be able to:
a. Determine if you need to use a one-tail or a two-tailed test
b. Determine if it is a one or two sample test.
c. Select the appropriate alpha level
d. Make a decision about the test significance and interpret the results.

Answer:

y = 36

x = 12

Hope it helps!

The straight line that is parallel to 3x + y = -3 and passes through point (3,2) is  y = -3x + 11.

We find the slope of the given line: 3x +  y= -3 can be rearranged to y = -3x - 3, which is in the slope-intercept form y = mx + b. The slope of this line is -3.

Since parallel lines have the same slope, the slope of the line we are looking for is also -3.

We use the point-slope form of an equation, y - y₁ = m(x - x₁), where m is the slope and (x₁, y₁) is the point the line passes through.

Plug in the values we have: y - 2 = -3(x - 3)

We simplify the equation: y - 2 = -3x + 9 => y = -3x + 11

Therefore, the equation of the line parallel to 3x +y=-3 through the point (3,2) is y = -3x + 11.

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Answer:

The width of the window is 122 inches

Step-by-step explanation:

654- known two sides(410) =244

divide 244/2, to get both unknown sides of the rectangular window, 122 inches

There will be 4 small boxes and 2 large boxes of granola bars.

A variable is an attribute or a phenomenon that can be measured and has a changing value over time.

Given,

Number of granola bars in the small box = 10

Number of granola bars in the large box = 30

The number of small boxes = three times the number of a large boxes

To Find,

The number of small boxes purchased =?

The number of large boxed purchased =?

Let the number of large boxes be y

The number of small boxes be x

Total number of boxes, x + y = 6         ..... equation i

Total number of granola bars in small box = 10x

Total number of granola bars in large box = 30x

So, 10x + 30x = 100

After dividing by 10 we get

x + 3y = 10                                               ..... equation ii

Subtracting equation ii from equation i

We get,   2y = 4

y = 2

Putting the value of y in equation i we get x = 4

So, there will be 4 small boxes and 2 large boxes of granola bars.

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a sample size of approximately 246 U.S. adults would be required to reduce the standard deviation of the sampling distribution to one-half the original value.

The standard deviation is a metric that reveals how much variance from the mean there is, including spread, dispersion, and spread. A "typical" variation from the mean is shown by the standard deviation. Because it uses the data set's original units of measurement, it is a well-liked measure of variability.

from the question:

Assuming a 95% confidence interval and an error rate equal to half the initial standard deviation, or E = 0.5, the following results are obtained:

[tex]n = [(1.96 / 0.5σ) / 0.70(1 - 0.70)]^2[/tex]

The population's standard deviation must be known in order to solve for n; however, this information is not provided in the problem description. Based on prior research or experience, we may substitute a standard deviation of 0.05 into the following formula:

[tex]n = [(1.96 / 0.5(0.05)) / 0.70(1 - 0.70)]^2 ≈ 246[/tex]

Hence, to cut the standard deviation of the sampling distribution to half its initial value, a sample size of about 246 American adults would be needed.

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Answer:

Below

Step-by-step explanation:

4 outlets/ 1.5 hr     *    7.5 hr = 20 outlets   ( see how 'hr' cancels out and you are left with 'outlets ?)

Answer: 20

Step-by-step explanation:

In 1.5 hours, the no. of electrical outlets rewired = 4

Then, in 1 hour the no. of electrical outlets rewired = 4/1.5

So, in 7.5 hours the no. of electrical outlets rewired =( 4/1.5 ) × 7.5 = 20.

The use of gears enables the exchange of torque for angular velocity (i.e., if the gears are of unequal size, the larger gear will experience higher torque but lower angular velocity than the smaller gear).

Any organized assembly of resources and procedures united and regulated by interaction or interdependence to accomplish a set of specific functions.

here, we have,

Two gears or pulleys must rotate at the same angular velocity if they are attached to the same axle.

Since the angle doesn't change the unit in any way, the work unit is also in ft-lbs. The rotating equivalent of a formula you might remember from physics is "Work = Force * Distance."

Energy is preserved in a gear train if friction-related heat losses are disregarded.

A gear ratio is the comparison of the number of rotations made by the driving gear system and the driven gear.

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Answer:

area = (1/2) · (p + q) · h

Step-by-step explanation:

McKenzie would take 6 hours to complete the landscaping job alone if Lindy calls in sick.

If McKenzie and Lindy can complete the landscaping job in 4 hours working together, it means their combined work rate is 1/4 of the job per hour. Let x be the number of hours it takes Lindy to complete the job alone, then McKenzie can complete the job in x-6 hours.

Using the formula for their individual work rates, we have:

[tex]1/x + 1/(x-6) = 1/4[/tex]

Multiplying both sides by [tex]4x(x-6)[/tex], we get:

[tex]4(x-6) + 4x = x(x-6)[/tex]

Expanding and simplifying, we get:

[tex]2x^2 - 12x - 48 = 0[/tex]

Dividing both sides by 2 and using the quadratic formula, we get:

[tex]x = (12 ± \sqrt{12^2 + 4248}) / (2*2)[/tex]

x = (12 ± 18) / 4

x = 7.5 or -1.5

Since we cannot have a negative time, the answer is that it would take Lindy 7.5 hours to complete the job alone, and McKenzie would take 1.5 hours less, or 6 hours, to complete the job alone if Lindy calls in sick.

Therefore, McKenzie would take 6 hours to complete the landscaping job alone if Lindy calls in sick.

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a) f(x) = x^3 -x^2 + 3x +7 is the correct answer

The expression √1−x^2, with the substitution x=cos(θ), can be simplified to sin(θ).

To write the expression as a trigonometric expression using the suggested substitution, we will replace x with cos(θ) in the expression. This gives us:

√1−cos^2(θ)

Now, we can use the Pythagorean identity, sin^2(θ) + cos^2(θ) = 1, to simplify the expression further. Rearranging the identity, we get:

sin^2(θ) = 1 - cos^2(θ)

Substituting this back into our original expression, we get:

√sin^2(θ)

Taking the square root of both sides, we get:

sin(θ)

Therefore, the expression √1−x^2, with the substitution x=cos(θ), can be simplified to sin(θ).

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This is a horizontal line passing through the point (-9, -3).

Slope is a measure of how steep a line is. It is defined as the ratio of the change in the y-coordinates of two points on a line to the change in the x-coordinates of those same points. In other words, slope is the amount by which the y-coordinate changes when the x-coordinate changes by 1 unit.

Since the given line is vertical, its slope is undefined. The slope of a line perpendicular to it is zero. Therefore, the slope of the graph of f is zero.

We can use the point-slope form of a linear equation to write the equation of the line passing through the point (-9, -3) with a slope of zero:

y - (-3) = 0(x - (-9))

Simplifying, we get:

y + 3 = 0

Subtracting 3 from both sides, we get:

y = -3

So the equation of the function f is:

f(x) = -3

Therefore, this is a horizontal line passing through the point (-9, -3).

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815 ÷ 8 = 101.875 ≈ 102

∴ The cafeteria should buy 102 bags.

Answer:

102 bags.

Step-by-step explanation:

You divided 815 by 8. The answer is 101.875 and you can't have half a bag so you round it up to the nearest whole number.

Answer:

Solve for the first variable in one of the equations, then substitute the result into the other equation.

Point Form:

(

0

,

−

3

)

Equation Form:

x

=

0

,

y

=

−

3

Step-by-step explanation:

Answer:

x=0 y=3

Step-by-step explanation:

3(0) + 5(3) = 15

0 + 15 = 15

15=15

Answer: 18cm

Step-by-step explanation:

The length of the radius of the circle with center O has a circumference of 36π is 18cm.

There are 6 people in a group. Their names are selected randomly and they act independently. The probability that the first person arriving has the same name as 1 or more people is 0. The probability that there are people in the group with the same name is 98.46%.

The probability that the initial arrival shares a name with one or more others is 0 percent. This is because the first person arriving has no one to compare their name with, so there is no chance that they will have the same name as someone else.

The probability that there are people in the group with the same name can be calculated using the formula

P(same name) = 1 - P(different names).

The probability of everyone having different names is calculated by multiplying the probabilities of each person having a different name from the previous person. This can be represented as

(6/6) * (5/6) * (4/6) * (3/6) * (2/6) * (1/6) = 0.0154.

Therefore, the probability of there being people in the group with the same name is 1 - 0.0154 = 0.9846 or 98.46%.

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Using the formula of the cylinder we know that the height of the given cylinder is 6.36 inches.

One of the most fundamental curvilinear geometric shapes, a cylinder has historically been a three-dimensional solid.

It is regarded as a prism with a circle as its base in basic geometry.

In several contemporary fields of geometry and topology, a cylinder can alternatively be characterized as an infinitely curved surface.

So, the cylinder formula for the volume is:

V = πr²h

Now, substitute the values as follows:

V = πr²h

180 = 3.14*3²h

180 =  28.26h

180/28.26 = h

6.36 = h

Therefore, using the formula of the cylinder we know that the height of the given cylinder is 6.36 inches.

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$\lambda - s$ is an eigenvalue of W – s$\lambda$ and $\mathbf{v}$ is the corresponding eigenvector.

Linear Algebra: Let W $\in$ $\mathbb{R}^{n \times n}$, s $\in$ $\mathbb{R}$, and $\lambda$ an eigenvalue of W. To prove that $\lambda$ – s is an eigenvalue of W – s$\lambda$, we will use the definition of eigenvalues and eigenvectors:

An eigenvalue $\lambda$ of a square matrix A $\in$ $\mathbb{R}^{n \times n}$ is a scalar such that there exists a nonzero vector $\mathbf{v} \in \mathbb{R}^n$ for which the following equation holds:

A$\mathbf{v}$ = $\lambda \mathbf{v}$

Therefore, we can rearrange the equation to show that W – s$\lambda$ $\mathbf{v}$ = $(\lambda -s) \mathbf{v}$, which implies that $\lambda - s$ is an eigenvalue of W – s$\lambda$ and $\mathbf{v}$ is the corresponding eigenvector.

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The expression cannot be factored over integers since the roots are not integers.

The error in Sarah's thought process is that she is assuming that the factoring of a quadratic equation can always be done by finding two numbers that add up to the coefficient of the middle term (in this case, -4) and multiply to the coefficient of the quadratic term (in this case, 5). However, this method only works when the quadratic expression is factorable over the integers, which is not always the case.

In fact, the expression [tex]5x^2-4x-9[/tex] cannot be factored over the integers, which means that there are no two integers whose product is [tex]5*(-9)=-45[/tex] and whose sum is -4. To confirm this, we can use the quadratic formula (-b ± \sqrt{(b^2-4ac)} )/2a, which gives the roots of the quadratic equation [tex]ax^2+bx+c=0[/tex]. For this expression, [tex]a=5, b=-4[/tex], and c=-9, so the roots are:

[tex]x=[-(-4)±sqrt{(-4)^2-45(-9)}]/(2*5\leq)[/tex]

[tex]x=(4±sqrt(196))/10\\x=(4±14)/10\\x=1 or x=-9/5[/tex]

Since the roots are not integers, the expression cannot be factored over the integers.

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The answers are:
a. \( \mathbf{v}=\overrightarrow{P Q} = (4, 4) \)
b. \( \|\mathbf{v}\| = 4\sqrt{2} \)
c. \( \overrightarrow{P Q}+\overrightarrow{Q P} = (0, 0) \)

The given points are point \( P \) be \( (-1,3) \) and point \( Q \) be \( (3,7) \).

a. To find \( \mathbf{v}=\overrightarrow{P Q} \), we subtract the coordinates of point \( P \) from the coordinates of point \( Q \):

\( \mathbf{v}=\overrightarrow{P Q} = (3-(-1), 7-3) = (4, 4) \)

b. To find \( \|\mathbf{v}\| \), we use the distance formula:

\( \|\mathbf{v}\| = \sqrt{(4-0)^2 + (4-0)^2} = \sqrt{16 + 16} = \sqrt{32} = 4\sqrt{2} \)

c. To find \( \overrightarrow{P Q}+\overrightarrow{Q P} \), we add the coordinates of \( \overrightarrow{P Q} \) and \( \overrightarrow{Q P} \):

\( \overrightarrow{P Q}+\overrightarrow{Q P} = (4, 4) + (-4, -4) = (0, 0) \)

Therefore, the answers are:

a. \( \mathbf{v}=\overrightarrow{P Q} = (4, 4) \)

b. \( \|\mathbf{v}\| = 4\sqrt{2} \)

c. \( \overrightarrow{P Q}+\overrightarrow{Q P} = (0, 0) \)

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The simplified expressions are: (a) z = 1/4, (b) 3z^2, (c) -4z, and (d) 3z^2.

To simplify each expression by performing the indici, we need to follow the order of operations and combine like terms. Here are the steps for each expression:

(a) z + 3z = 1
First, we need to combine the like terms on the left side of the equation. Since both terms have the variable z, we can add them together:
4z = 1
Next, we need to solve for z by isolating the variable on one side of the equation. We can do this by dividing both sides of the equation by 4:
z = 1/4

(b) z * 3z
To simplify this expression, we just need to multiply the two terms together:
3z^2

(c) -z - 3z
To simplify this expression, we need to combine the like terms. Since both terms have the variable z, we can add them together:
-4z

(d) (-z)(-3z)
To simplify this expression, we just need to multiply the two terms together. Remember that a negative times a negative is a positive:
3z^2

So the simplified expressions are: (a) z = 1/4, (b) 3z^2, (c) -4z, and (d) 3z^2.

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Answer:

A. 3/2

Step-by-step explanation:

what is a dilation? a dilation can make objects bigger or smaller.

10 times [tex]\frac{3}{2}[/tex] is 15

4 times [tex]\frac{3}{2}[/tex] is 6

8 times [tex]\frac{3}{2}[/tex] is 12

therefore the answer is A.. [tex]\frac{3}{2}[/tex]

Answer:

A. 3/2

Step-by-step explanation:

What is dilation?

The original image is DEFG. It is called the pre-image

The dilated image is D'E'F'G' and is called image

A transformed image has the coordinates labeled with a '

In this case the transformed image is a dilation of the original pre-image. A dilated image is a cop.y of the pre-image but with either an expansion or a compression

If the image is larger than the pre-image it is an expansion, if smaller than the pre-image then it is a compression

With dilation, comes a scale factor which indicates how much a pre-image has been expanded or compressed

Solution

If you look at the two images, take any side in the pre-image and compare its length with the corresponding side you can find the scale factor

Here if you take a side, say DE = 4 and look at the corresponding side D'E' = 6you see that the DE side has been expanded with a scale factor of 6/4 = 3/2

This scale factor applies to all sides, so you need to take only one side to find the scale factor

Answer: Scale Factor of dilation = 3/2

This is option A

There are 27720 different arrangements possible.

The number of different arrangements possible can be found using the formula for permutations with repetition:

n! / ([tex]p{1}[/tex]! * [tex]p{2}[/tex]! * ... *[tex]p_{k}[/tex]!)

where n is the total number of items, and [tex]p{1}[/tex], p2, ..., pk are the number of times each item is repeated.

In this case, n = 12 (the total number of balls), [tex]p{1}[/tex] = 5 (the number of yellow balls), [tex]p{2}[/tex] = 4 (the number of green balls), and [tex]p{3}[/tex] = 3 (the number of black balls).

So the number of different arrangements possible is:

12! / (5! * 4! * 3!)

= 479001600 / (120 * 24 * 6)

= 27720

Therefore, number of different arrangements possibleis 27720.

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According to the given information product of (3x - 2) and (2z + 6) is 6xz + 18x - 4z - 12.

In mathematics, expressions are also combinations of constants, variables, operators, and function calls that represent mathematical operations or relationships.

Let's start with distributing the first term of the first expression to both terms of the second expression, then distributing the second term of the first expression to both terms of the second expression:

(3x - 2)(2z + 6)

= 3x(2z + 6) - 2(2z + 6)

= 6xz + 18x - 4z - 12

Now, let's use the FOIL method to find the same product:

(3x - 2)(2z + 6)

= 3x(2z) + 3x(6) - 2(2z) - 2(6)

= 6xz + 18x - 4z - 12

As you can see, both methods result in the same product: 6xz + 18x - 4z - 12.

Therefore, according to the given information product of (3x - 2) and (2z + 6) is 6xz + 18x - 4z - 12.

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Answer:

m= 3/4

Step-by-step explanation:

hope this helps

There is a trade-off between stability and speed when it comes to the slope of a train's wheels.

What is slope ?

Slope is a measure of the steepness of a line or a surface. In mathematics, slope is often represented by the letter "m" and is calculated as the change in the vertical direction (y-axis) divided by the change in the horizontal direction (x-axis) between two points on the line or surface.

Changing the slope of a train's wheels can have both positive and negative effects on the train's overall performance.

On the positive side, increasing the slope of the wheels can improve the train's stability and safety as it goes around curves. This is because the inward slope of the wheels helps to counteract the centrifugal force that pushes the train outward as it goes around curves. By increasing the slope of the wheels, this counteracting force can be increased, which can help prevent derailments and improve the overall safety of the train.

On the negative side, increasing the slope of the wheels can decrease the train's efficiency at producing speed. This is because the slope of the wheels creates additional friction between the wheels and the track, which can slow the train down and require more energy to maintain speed. As the slope of the wheels increases, this friction also increases, which can make the train less efficient at producing speed and more costly to operate.

Therefore, there is a trade-off between stability and speed when it comes to the slope of a train's wheels. Train designers must find the optimal balance between these two factors to ensure that the train is both stable and efficient.

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The series converges.

1. This is an alternating series, and therefore, the series converges by the Alternating Series Test. This is because the sequence of the absolute value of the terms, {|3n+5|}^(1/3), is a monotonically decreasing sequence, and it is bounded. To determine how many terms are necessary to get within 0.05 of the sum, we use the formula:

Sn≈s​[infinity]​+a1r1/1−r

where a1 is the first term, and r is the common ratio. In this case, we have a1 = (3+5)^(1/3) = 2, and r = (-1)^(1/3) = -1. Thus, Sn ≈ 2 + (2)(-1)/1 - (-1) = 4.

Since the series is alternating, it is absolutely convergent.

2. This series is also an alternating series, so it is absolutely convergent by the Alternating Series Test. The sequence of the absolute value of the terms, {|3n+4|}^(1/ln(5n+2)), is a monotonically decreasing sequence, and it is bounded. Therefore, the series converges.

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The equation of the line through the point (3, -7) that is parallel to the line 4x + 7y - 10 = 0 is y = (-4/7)x - (37/7) in the point-slope form

To find the equation of the line through the point (3, -7) that is parallel to the line 4x + 7y - 10 = 0, we first need to find the slope of the given line. We can do this by rearranging the equation to the slope-intercept form, y = mx + b, where m is the slope.

4x + 7y - 10 = 0

7y = -4x + 10

y = (-4/7)x + (10/7)

The slope of the given line is -4/7. Since we want a line that is parallel to this one, the slope of our new line will also be -4/7.

Now we can use the point-slope form of a line, y - y1 = m(x - x1), to write the equation of the new line. We plug in the given point (3, -7) for (x1, y1) and the slope -4/7 for m.

y - (-7) = (-4/7)(x - 3)

y + 7 = (-4/7)x + (12/7)

y = (-4/7)x + (12/7) - 7

y = (-4/7)x - (37/7)

So the equation of the line through the point (3, -7) that is parallel to the line 4x + 7y - 10 = 0 is y = (-4/7)x - (37/7) in the point-slope form.

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The Integer Root Theorem states that the possible integer roots of a polynomial are the divisors of the constant term (100). Therefore, the candidate integer roots for the polynomial [tex]f(x) = -x^5 + 22x^4 - 8x^3 - 8x^2 + 5x + 100[/tex] are: 1, -1, 2, -2, 4, -4, 5, -5, 10, -10, 20, -20, 25, -25, 50, and -50.

According to the integer root theorem, the possible integer roots of a polynomial f(x) are the factors of the constant term divided by the factors of the leading coefficient. In the case of f(x)=-x^(5)+22x^(4)-8x^(3)-8x^(2)+5x+100, the constant term is 100 and the leading coefficient is -1.

The factors of 100 are: 1, 2, 4, 5, 10, 20, 25, 50, and 100. The factors of -1 are: 1 and -1.

Therefore, the possible integer roots of f(x) are: ±1, ±2, ±4, ±5, ±10, ±20, ±25, ±50, and ±100.

So, the candidate integer roots of  [tex]f(x) = -x^5 + 22x^4 - 8x^3 - 8x^2 + 5x + 100[/tex]  are: 1, -1, 2, -2, 4, -4, 5, -5, 10, -10, 20, -20, 25, -25, 50, -50, 100, and -100.
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Answer: C

Step-by-step explanation: Just replace x=1,2,3,4 to see which answers satisfy the given conditions