Suppose the heights of 18-year-old men are approximately normally distributed, with mean 71 inches and standard deviation 5 inches.
(a) What is the probability that an 18-year-old man selected at random is between 70 and 72 inches tall? (Round your answer to four decimal places.)


(b) If a random sample of eight 18-year-old men is selected, what is the probability that the mean height x is between 70 and 72 inches? (Round your answer to four decimal places.)


(c) Compare your answers to parts (a) and (b). Is the probability in part (b) much higher? Why would you expect this?
The probability in part (b) is much higher because the mean is larger for the x distribution.
The probability in part (b) is much higher because the standard deviation is smaller for the x distribution.
The probability in part (b) is much lower because the standard deviation is smaller for the x distribution.
The probability in part (b) is much higher because the mean is smaller for the x distribution.
The probability in part (b) is much higher because the standard deviation is larger for the x distribution.

the triangles are similar, corresponding parts of the triangles are equal in measure. Thus, it is reasonable to conclude that [tex]AB ≅ DE.[/tex]

It is reasonable to conclude that [tex]AB ≅ DE[/tex]because triangles ABC and DEF are similar.

This means that corresponding parts of the two triangles are equal in measure. Specifically, ∠A and ∠D are equal in measure, as are ∠B and ∠E.

Therefore, the corresponding sides AB and DE are equal in measure.

A way to show that the two triangles are similar is by using the AA Similarity Postulate.

This postulate states that if two angles of one triangle are equal in measure to two angles of a second triangle, then the two triangles are similar. In this case, [tex]∠A ≅ ∠D and B ≅ ∠E[/tex], which means the two triangles are similar.

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Answer: 61

Step-by-step explanation:

explination in image

The yellow band has a surface area of 20x + 100 square inches.

The area of the yellow band is the difference between the area of the yellow square and the area of the orange square.

The yellow square has a side length of (x + 10) inches, where 10 inches is the sum of the widths of the two yellow bands that border the orange square.

So the area of the yellow square is:

A_ yellow = (x + 10)²

The orange square has a side length of x inches, so its area is:

A_ orange = x²

The area of the yellow band is the difference between these two areas:

A_ band = A_ yellow - A_ orange

= (x + 10)² - x²

= x² + 20x + 100 - x²

= 20x + 100

Therefore, the area of the yellow band is 20x + 100 square inches.

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Therefore , the solution of the given problem of surface area comes out to be the box's surface size is 304 in².

Its total size can be determined by figuring out how much room would be required to completely cover the outside. When choosing comparable substance with a rectangular shape, the surroundings are taken into account. Something's total dimensions are determined by its surface area. The volume of water that a cuboid can contain depends on the number of edges that are present in the region between its four trapezoidal angles.

Here,

Six faces make up the box: the top, bottom, two sides, and both extremities. Given that both the top and lower faces are rectangles with 10 by 8-inch measurements, the area of each face is:

=>  80 in²= 10 in * 8 in

The region of each side face is thus:

=> 10 in * 4 in = 40 in²

=>  8 in * 4 in = 32 in²

As a result, the box's surface area equals the total of the areas of its six faces:

=>  Surface area = 2(80 in²) + 2(40 in²) + 2(32 in²)

=>   Surface area = 160 in² + 80 in² + 64 in²

=>   Surface area = 304 in²

Consequently, the box's surface size is 304 in².

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True. The coefficient of variation is a better measure of risk than the standard deviation if the expected returns of the securities being compared differ significantly.

The coefficient of variation (CV) is a relative measure of risk that takes into account the standard deviation and the mean of a distribution. It is a better measure of risk than the standard deviation when comparing securities with significantly different expected returns because it adjusts for the differences in the means.

The CV is calculated as the ratio of the standard deviation to the mean, and it allows for the comparison of the risk of investments with different expected returns on a standardized basis. Therefore, it is a useful tool for investors who want to compare the risk of investments that have different levels of expected returns. However, it should be noted that the CV has limitations and should not be the sole measure of risk used in investment analysis.

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The equation of the circle is (x - 5)² + (y - 4)² = (24.4)².

To write the equation of a circle with endpoints, we need to determine the center and radius of the circle.

Step 1: Determine the center of the circle by using the endpoints of the diameter. The midpoint of the diameter is the center of the circle. The midpoint formula is as follows. (x1 + x2/2, y1 + y2/2) = (center)

Use the given endpoints to find the center of the circle. (-5 + 15)/2, (-3 + 11)/2 = (5, 4)

Thus, the center of the circle is (5, 4).

Step 2: Determine the radius of the circle. The radius of the circle is half of the diameter. The distance formula is used to determine the distance between the two endpoints of the diameter. √((x2 - x1)² + (y2 - y1)²) = radius

Use the given endpoints to find the radius.√((15 - (-5))² + (11 - (-3))²) = √(20² + 14²) = √(400 + 196) = √596 ≈ 24.4

Thus, the radius of the circle is ≈24.4.

Step 3: Use the center and radius to write the equation of the circle. (x - 5)² + (y - 4)² = (24.4)². Therefore, the equation of the circle is (x - 5)² + (y - 4)² = (24.4)².

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Answer:

a. The sum of the interior angles of a regular polygon with n sides can be found using the formula (n-2) x 180 degrees. Using this formula, we know the sum of the interior angles of a pentagon is (5-2) x 180 = 540 degrees. Since the sum of the interior angles of a polygon increases by 180 degrees for each additional side, we can guess that the sum of the interior angles of a 17-gon would be (17-2) x 180 = 2700 degrees.

b. For concave polygons, the sum of the interior angles may not follow the same pattern as that of regular polygons. It is possible for the sum of the interior angles of a concave polygon to be greater or less than the sum of the interior angles of a regular polygon with the same number of sides. So, it is difficult to make an accurate guess without more information about the specific shape of the concave 17-gon.

c. The sum of the exterior angles of any convex polygon always equals 360 degrees because each exterior angle is supplementary to its adjacent interior angle. In other words, the exterior angle and the adjacent interior angle form a straight line, which is 180 degrees. Since there are n exterior angles in an n-sided polygon, the sum of all the exterior angles is n x 180 degrees. However, each exterior angle is counted once for each vertex, and there are n vertices, so we need to divide by n to get the total sum of exterior angles, which is (n x 180) / n = 180 degrees.

d. For a concave polygon, the sum of the exterior angles may be greater than or less than 360 degrees, depending on the shape of the polygon. In a concave polygon, some of the exterior angles will be greater than 180 degrees, which means that their adjacent interior angles will be less than 180 degrees. Since the sum of the exterior angles is equal to the sum of the adjacent interior angles, some of the exterior angles will need to be subtracted from 360 degrees to get the total sum of exterior angles. However, without more information about the specific shape of the concave polygon, it is difficult to make an accurate guess.

Answer:

a. The sum of the angle measures of the regular pentagon is 540 degrees, and the sum of the angle measures of the concave pentagon is 720 degrees. Both of these polygons have five sides. If we assume that the sum of the angle measures of a polygon with n sides is proportional to n, we can use the ratios of the number of sides in each polygon to make an estimate for the sum of the interior angles of a 17-gon. The ratio of the number of sides in a 17-gon to the number of sides in a regular pentagon is 17/5. If we multiply the sum of the angle measures of the regular pentagon by this ratio, we get an estimate for the sum of the angle measures of a 17-gon:

540 * (17/5) = 1836 degrees.

So, we would guess that the sum of the interior angles of a 17-gon is 1836 degrees.

b. We can use a similar reasoning as in part (a) to estimate the sum of the interior angles of a concave 17-gon. The ratio of the number of sides in a concave pentagon to the number of sides in a concave 17-gon is 5/17. If we multiply the sum of the angle measures of the concave pentagon by this ratio, we get an estimate for the sum of the angle measures of a concave 17-gon:

720 * (5/17) = 211.76 degrees.

So, we would guess that the sum of the interior angles of a concave 17-gon is 211.76 degrees.

c. The sum of the exterior angles of a convex polygon always equals 360 degrees because the exterior angle at each vertex of the polygon is equal to the sum of the two adjacent interior angles. If we add up all of the exterior angles of a polygon, we are essentially adding up all of the vertex angles twice (once for each adjacent exterior angle). Therefore, the sum of the exterior angles of a convex polygon is equal to 2 times the sum of the interior angles. Since the sum of the interior angles of any n-sided polygon is (n-2)*180 degrees, the sum of the exterior angles is:

2 * (n-2) * 180 = 360(n-2) degrees.

d. It is not possible to make a generalization about the sum of the exterior angles of a concave polygon, because the sum of the exterior angles of a concave polygon can be greater than, less than, or equal to 360 degrees, depending on the polygon's shape. The sum of the exterior angles of a concave polygon can be greater than 360 degrees if the polygon has one or more reflex angles, which are angles greater than 180 degrees. In this case, the exterior angle at each vertex is less than the adjacent interior angle, so the sum of the exterior angles is greater than 360 degrees. On the other hand, if a concave polygon has no reflex angles, the sum of the exterior angles will be less than 360 degrees.

Step-by-step explanation:

As per the given distance, the bus and the motorcycle will pass each other at 4:50 pm.

Now, let's find the distance the bus travels during that time. We know the speed of the bus is 60 mph, so we can use the formula distance = speed x time. Thus, the distance the bus travels is:

distance = speed x time

distance = 60 x t

Next, let's find the distance the motorcycle travels during the same time. The speed of the motorcycle is 72 mph, so we can use the same formula to find the distance the motorcycle travels:

distance = speed x time

distance = 72 x (t - 3/4)

Here, we subtract 3/4 from the time because the motorcycle leaves 45 minutes later than the bus. Remember, we need to convert 45 minutes to hours by dividing it by 60. Therefore, 45 minutes is equal to 3/4 of an hour.

Now that we have both distances, we can set them equal to each other since the bus and the motorcycle will meet at the same point in time:

60t = 72(t - 3/4)

Let's simplify and solve for "t":

60t = 72t - 54

12t = 54

t = 4.5

Therefore, it will take 4.5 hours for the bus and the motorcycle to meet each other. But, we need to find out what time that will be. We know the bus left at 12:20 pm, so we add 4.5 hours to that time:

12:20 pm + 4.5 hours = 4:50 pm

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Answer:

A

Step-by-step explanation:

The coordinate of the vertices (x,y) after a reflection over the x-axis is (x, -y). It is also known as a rule.

Coordinates are two numbers (Cartesian coordinates) or a letter and a number that point to a specific point on a grid known as a coordinate plane. A coordinate plane has four quadrants and two axes: x (horizontal) and y (vertical).

here, we have,

A reflection of a point, line, or figure in the x-axis entailed mirroring the image over the x-axis. In this case, the x-axis is referred to as the axis of reflection.

The rule for reflecting over the x-axis is to negate the value of each point's y-coordinate while keeping the x-value constant.

For instance, when point P with coordinates (7,3) is reflected across the x-axis and mapped onto point P', P"s coordinates are (7,-3). The x-coordinate for both points remained unchanged, but the y-coordinate changed from 3 to -3.

Hence, The coordinate of the vertices (x,y) after a reflection over the x-axis is (x, -y). It is also known as a rule.

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In the given scenario, the average current produced within the loop is approximately 2.13 A.

We can begin by computing the change in magnetic flux across the loop as it expands to determine the average current generated within the loop.

The following equation provides the magnetic flux across a loop:

Φ = B * A * cos(θ)

ΔΦ = B * ΔA

ΔA = A₂ - A₁ = π * (1.00 m)² - π * (0.40 m)² = π * (1.00² - 0.40²) = π * (1.00 + 0.40)(1.00 - 0.40) = π * (1.40)(0.60) = 0.84π m²

So,

ΔΦ = B * ΔA = (24 mT) * (0.84π m²) = 20.25π m²·T

emf = ΔΦ / Δt = (20.25π m²·T) / (1.0 s) = 20.25π V

As:

emf = I * R

So, again

I = emf / R = (20.25π V) / (30 Ω) ≈ 2.13 A

Thus, the average current produced within the loop is approximately 2.13 A.

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Options B and C, Utilizing basic fractions, the qualities scenario displays a result of 0. 4 Jesse completed 40 out of 100 arithmetic problems and rode his bike for 4 of the 10 kilometers.

We are seeking a scenario that corresponds to a value of 0.4 or 40% among the possibilities mentioned, which represent various sections or fractions of a total.

Jesse rode his bike 4 out of the 10 miles in option B, which is equal to 0.4 or 40%.

Similarly, Jesse completed 40 of the 100 arithmetic problems in option C, which is likewise 0.4 or 40%. The other choices don't correspond to a 0.4 value.

A fraction of 2/3, or 0.666, is represented by choice A, a fraction of 4/100, or 0.04, by option D, and a fraction of 1/2, or 0.5, by option E.

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The question is -

Which of the following scenarios shows a value of 0.4? Select all that apply.

A. Jesse sold 40 out of 60 items at a garage sale.

B. Jesse rode 4 out of 10 miles on his bike.

C. Jesse finished 40 out of 100 math problems.

D. Jesse ate 4 out of 100 jellybeans.

E. Jesse returned 4 out of 8 library books.

Answer:

2/3 is equivalent to the fraction 2/6

The volume of the tetrahedron is 1.0667 cubic units.

The tetrahedron is enclosed by the coordinate planes and the plane 10x + y + z = 4.

To find the volume of the tetrahedron using a triple integral, we can use the following bounds:

0 ≤ z ≤ 4 - 10x - y

0 ≤ y ≤ 4 - 10x

0 ≤ x ≤ 0.4

This is because the tetrahedron is bound by the coordinate planes, so x, y, and z all must be positive, and the plane 10x + y + z = 4 sets the upper bound for z and y, and the upper bound for x is simply where the plane intersects the x-axis (which can be found by setting y and z equal to 0 and solving for x).

The triple integral to find the volume of the tetrahedron is then:

V = ∫∫∫ dV = ∫0^0.4 ∫0^(4-10x) ∫0^(4-10x-y) dz dy dx

Evaluating this integral, we get:

V = ∫0^0.4 ∫0^(4-10x) (4-10x-y) dy dx

= ∫0^0.4 [4y - 10xy - (1/2)y^2]0^(4-10x) dx

= ∫0^0.4 [4(4-10x) - 10x(4-10x) - (1/2)(4-10x)^2] dx

= ∫0^0.4 (-25x^2 + 20x + 8) dx

= [-25/3 x^3 + 10 x^2 + 8x]0^0.4

= 1.0667

Therefore, the volume of the tetrahedron is approximately 1.0667 cubic units.

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Answer:

B

Step-by-step explanation

$35

He would need $35 to buy 7 pizzas because if you divide 25 and 5, you would get 5.

5+5+5+5+5+5+5=35

5x7=35

Answer:

$35

Step-by-step explanation:

So basically to find the unit price we need to craft an equation. Lets imagine one pizza is p.

We can craft this equation:

5p = 25

Divide both sides by 5

p = 5

How we just multiply that unit price by 7 to get 35, which is the answer

I put a lot of thought and effort into my answers, so I would really appreciate a Brainliest!

If f(x,y) > 0 and is a continuous function defined over a rectangle R=[a,b]x[c,d], then the double integral over R of f(x,y) can be interpreted as the volume of a solid that lies in the first octant and under the graph of the function f(x,y) over the region R.

The geometric interpretation of the double integral over R of f(x,y) if f(x,y) > 0, where f is a continuous function defined on a rectangle R = [a,b] × [c,d] is given as follows:

The double integral of f(x,y) over R, if f(x,y) > 0, gives the volume under the graph of the function f(x,y) over the region R in the first octant.

Consider a point P (x, y, z) on the graph of f(x, y) that is over the region R, and let us say that z = f(x,y). If f(x,y) > 0, then P is in the first octant (i.e. all its coordinates are positive).

As a result, the volume of the solid that lies under the graph of f(x,y) over the region R in the first octant can be found by integrating the function f(x,y) over the rectangle R in the xy-plane, which yields the double integral.

The following formula represents the double integral over R of f(x,y) if f(x,y) > 0:

∬Rf(x,y)dydx

The geometric interpretation of the double integral over R of f(x,y) if f(x,y) > 0 is given by the volume of the solid that lies under the graph of the function f(x,y) over the region R in the first octant.

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This method is designed to increase the likelihood that each baby will be a 15 girls is above 12.6 so it is significant high. It seems that method is effective.

Here we have

n=17, p=0.5

(a)

The mean is

np=17*0.5=8.5

The standard deviation is

[tex]\sigma=\sqrt{ np(1-p) } = 2.1[/tex]

(b)

Significantly low:

[tex]\mu[/tex] - 2[tex]\sigma[/tex] = 8.5 – 2* 2.1 = 4.4

Significantly high:

[tex]\mu[/tex] + 2[tex]\sigma[/tex] = 8.5+2 * 2.1 = 12.6

(c)

Since 15 girls is above 12.6 so it is significant high. It seems that method is effective.

Standard deviation is a statistical measure that describes the amount of variation or dispersion of a set of data from its mean or average value. In other words, it measures how much the data is spread out from the central tendency. It is calculated as the square root of the variance, which is the average of the squared differences between each data point and the mean.

The standard deviation is expressed in the same units as the data and is typically denoted by the symbol σ. A small standard deviation indicates that the data points are clustered around the mean, while a large standard deviation indicates that the data points are widely spread out from the mean.

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Complete Question: -

Assume that different groups of couples use a particular method of gender selection and each couple gives birth to one baby. This method is designed to increase the likelihood that each baby will be a​ girl, but assume that the method has no​ effect, so the probability of a girl is 0.5. Assume that the groups consist of 17 couples. Complete parts​ (a) through​ (c) below.

a. Find the mean and the standard deviation for the numbers of girls in groups of 17 births.

The value of the mean is μ=_____ (Type an integer or a decimal. Do not​ round.)

The value of the standard deviation is σ=____​(Round to one decimal place as​ needed.)

b. Use the range rule of thumb to find the values separating results that are significantly low or significantly high.

Values of ___ girls or fewer are significantly low. ​(Round to one decimal place as​ needed.)

Values of ___ girls or greater are significantly high. ​(Round to one decimal place as​ needed.)

c. Is the result of 15 girls a result that is significantly​ high? What does it suggest about the effectiveness of the​ method?

The result ____ is not. is. significantly​ high, because 15 girls is greater than. less than. equal to _______ __ girls. A result of 15 girls would suggest that the method _______ is effective. is not effect.

Therefore, the ladder is approximately 8.72 feet away from the house.

Pythagoras' theorem is a fundamental theorem in mathematics that states that in a right-angled triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides. In equation form, it can be written as:

c² = a² + b²

where c is the length of the hypotenuse, and a and b are the lengths of the other two sides of the right triangle.

Here,

We can use the Pythagorean theorem to solve this problem. Let x be the distance from the base of the ladder to the house.

In equation form, it can be written as:

c² = a² + b²

where c is the length of the hypotenuse, and a and b are the lengths of the other two sides of the right triangle.

Then we have:

x² + 18² = 20²

Simplifying and solving for x, we get:

x² = 20² - 18²

=400 - 324

= 76

x = √(76)

= 8.72 (rounded to two decimal places)

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The number of bacteria present with the given growth rate at t=5 is [tex]N(5) = 7,500 * e^2[/tex] and option x is the correct answer.

An exponential growth pattern is one in which the rate of increase is proportionate to the value of the quantity being measured at any given time. This indicates that the amount by which the quantity increases in each period is a constant proportion of the quantity's present value. Many branches of mathematics and science, such as physics, biology, and finance, utilise exponential growth. Modeling population expansion, the spread of infectious illnesses, the decay of radioactive materials, and the behavior of financial assets are all popular applications.

Given that, the number of bacteria present was 7,500.

The exponential growth is given by the formula:

[tex]N(t) = N(0) * e^{(kt)}[/tex]

Substituting the values N(0) = 7,500 and the growth rate is k = 2/5 we have:

[tex]N(5) = 7,500 * e^{(2/5 * 5)}\\N(5) = 7,500 * e^2[/tex]

Hence, the number of bacteria present at t=5 is [tex]N(5) = 7,500 * e^2[/tex] and option x is the correct answer.

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Answer:

Let the height of the parallelogram be h

From :the formula of finding Area of the parallelogram

Answer:

B

Step-by-step explanation:

given,

circumference of circle= 37.68ft

diameter of circle= 12ft

now,

circumference of circle = 2πr

37.68=2πr

37.68/2=πr

18.84 = 22/7 × r

radius (r) = 6ft

according to question, we have

number of students that can fit on circle = circumference/ radius

which is

37.68/6 ft

To find the volume under a surface and above a rectangle, use a double integral. Integrate the surface function over the rectangle and approximate using Riemann sums or numerical methods to obtain an estimate of the volume

To find the volume under a surface and above a rectangle in three-dimensional space using a double integral, we can follow these steps:

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The correlation coefficient r=-0.898. From this, we can conclude that the correlation is strong.

The researcher wants to determine whether the age of the person downloading songs helps predict the number of songs downloaded. The age and the number of songs downloaded per month data are as follows:

Age Number of Songs Downloaded153433183827192116486

The researcher can use the correlation coefficient to measure the correlation between the two variables. The correlation coefficient is denoted by r. It lies between -1 and +1. Here's what it means: If r is close to -1, then there is a strong negative correlation between the two variables. If r is close to +1, then there is a strong positive correlation between the two variables. If r is close to 0, then there is no correlation between the two variables.

The calculated correlation coefficient is r=-0.898. This indicates that there is a strong negative correlation between the age of the person downloading songs and the number of songs downloaded. Therefore, we can say that the correlation is strong.

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Answer:

a) Equation B is correct

b) u = 5.2 m

Step-by-step explanation:

              [tex]\sf Sin \ \theta = \dfrac{opposite \ side \ \angle64^\circ}{hypotenuse}\\\\\\Sin \ 64^\circ = \dfrac{u}{5.8}\\\\\\0.8987 = \dfrac{u}{5.8}[/tex]

    0.8987 * 5.8 = u

                    u   = 5.2 m

The mass of the frustum is 784kg

Remember that a frustum is a unique 3D object that is derived by cutting the apex of a cone or a pyramid.

We should know that since pyramid 1 and pyramid 2 are similar,

The perpendicular height of pyramid 2 is 10*4/8 = 5cm

So the volume of [pyramid 1 is =V₁ = 1/3*8²*10 = 640/3 cm³

The voluume of pyramid 2 V₂ = 1/3*4²*5 = 40/3 cm³

So the volume of frustum is 640/3 cm³ - 40/3 cm³ = 560/3 cm³

Recall mass = density*volume

So the mass is = 560/3 * 42 = 784g

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The solution for the simultaneous of equations 4x + 7y = 40 and 4x + 4y = 4 by elimination are x = -11, y = 12

we shall write the equations as:

4x + 7y = 40...(1)

4x + 4y = 4...(2)

subtract equation (2) from (1) to eliminate x

4x + 7y - 4x - 4y = 40 - 4

3y = 36

divide through by 3

y = 12

put the value 12 for y in equation (1) to get

4x + 7(12) = 40

4x + 84 = 40

4x = 40 - 84 {subtract 84 from both sides}

4x = -44

divide through by 4;

x = -11

Therefore, the solution for the simultaneous of equations 4x + 7y = 40 and 4x + 4y = 4 by elimination are x = -11, y = 12

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Answer:

y=-3x -8

Step-by-step explanation:

4= -3(-4) = b

b=4-12 = -8

y=-3x -8

The statistical test that a researcher could use to test the null hypothesis that the mean body temperature of residents in a nursing home is 98.6°F is a one-sample t-test.

A statistical test is a method that enables the comparison of the collected data with the assumed distribution of the data. A statistical test aids in determining if the outcomes of the experiment or research are caused by the treatment or if they are due to the random variation in the data.

A null hypothesis is a type of hypothesis that predicts the absence of a relationship between variables or groups. The null hypothesis claims that no difference exists between two variables or groups, and that any observed differences are due to chance.

Alternative hypotheses are used to reject null hypotheses, as they predict the presence of a relationship between variables or groups.

The significance level, which is the probability of committing a Type I error, is often used to set the null hypothesis. The statistical test that a researcher could use to test the null hypothesis that the mean body temperature of residents in a nursing home is 98.6°F is a one-sample t-test.

The t-test will aid in determining if the difference between the mean body temperature of residents in the nursing home and 98.6°F is statistically significant.

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