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katen-ka-za [31]
2 years ago
10

Susan Sound predicts that students will learn most effectively with a constant background sound, as opposed to an unpredictable

sound or no sound at all. She randomly divides twenty-four students into three groups of eight. All students study a passage of text for 30 minutes. Those in group 1 study with background sound at a constant volume in the background. Those in group 2 study with noise that changes volume periodically. Those in group 3 study with no sound at all. After studying, all students take a 10-point multiple choice test over the material. Their scores follow: Table Constant sound Random Sound No Sound 7 5 2 4 5 4 6 3 7 8 4 1 6 4 2 6 7 1 2 2 5 9 2 5 1. State the type of statistical test that you will use to conduct your hypothesis test.
Mathematics
1 answer:
alukav5142 [94]2 years ago
8 0

Answer:

An ANOVA test

Step-by-step explanation:

You will use the ANOVA test, which is a test that compares the means of more than 2 samples.  Since the teacher used 3 test groups, she would have to use this test if she wanted to do a hypothesis test to determine if the means are equal.  

*This test only tells us if the means are equal, it won't say which is greater than the other.  You would have to do 3 individual hypothesis tests comparing 2 means at a time in order to determine that.

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The answer is 26

Explanation:
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7 0
2 years ago
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svetlana [45]

Answer:

Step-by-step explanation:

4 + 2x < 6 + 6x

4 - 4x < 6

-4x < 2

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7 0
3 years ago
Read 2 more answers
1) What is the solution of the given system?
m_a_m_a [10]

Answer:

1  x=-2.5  y = -5.5

2.  x=5  y=1

Step-by-step explanation:

1) What is the solution of the given system?

5x-y=-7

3x-y=-2

Multiply the second equation by -1

-1*(3x-y)=-1(-2)

-3x +y = 2


Now add the first equation to the modified second equation

5x-y=-7

-3x +y = 2

------------------

2x = -5

Divide each side by 2

2x/2 = -5/2

x = -2.5

Now we need to find y

-3x+y =2

-3(-2.5) +y =2

7.5 +y =2

Subtract 7.5 from each side

7.5 -7.5 +y =2-7.5

y = -5.5


2) what is the solution of the given system?

5x+7y=32

8x+6y=46

Divide the second equation by 2

8x/2+6y/2=46/2

4x+3y =23


Multiply the first equation by 4

4 (5x+7y)=32*4

20x+28y = 128


Now multiply the modified 2nd equation by -5

-5(4x+3y )=-5(23 )

-20x -15y = -115


Lets add the new equations together to eliminate x

20x+28y = 128

-20x -15y = -115

---------------------

      13y = 13

Divide each side by 13

13y/13 =13/13

y=1

Now substitute back in to find x

5x+7y=32

5x +7(1) =32

5x +7 =32

Subtract 7 from each side

5x+7-7 =32-7

5x =25

Divide by 5

5x/5 =25/5

x=5





3 0
3 years ago
A diameter intersects a semi-circle. What is the arc measure of a semi-circle?
Nesterboy [21]

D. Cannot be determined.

Where does it intersect the semi-circle? If its anywhere then cannot determined.

Hope this helps.

3 0
3 years ago
A pen in the shape of an isosceles right triangle with legs of length x ft and hypotenuse of length h ft is to be built. If fenc
Vaselesa [24]

Answer:

\frac{8h}{\sqrt{2}} + 16h

Step-by-step explanation:

First we need to compute the side length as a function of h

So x be the side length of the right isosceles triangle, in Pythagorean formula we have

x^2 + x^2 = h^2

2x^2 = h^2

x = \frac{h}{\sqrt{2}}

The cost for the legs is

C_l = 4*2x = \frac{8h}{\sqrt{2}}

The cost for the hypotenuse is

C_h = 16h

So the total cost in term of h is

C = C_l + C_h = \frac{8h}{\sqrt{2}} + 16h

5 0
3 years ago
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