What is the primary thing that makes the repeated measures t-test different from

Question

What is the primary thing that makes the repeated measures t-test different from other kinds of t-test calculations?

Question 1 options:

The focus on difference scores

The focus on using population means from the alternative hypothesis as opposed to the population mean from the null hypothesis

The focus on making sure that you are using multiple samples

The new formula for figuring out the mean

Actually the format of the repeated measures t-test is completely different from all other t-test. There is no comparison among them.

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Question 2 (1 point)

Which of the following is the typical non-directional null hypothesis for the repeated measures t-test?

Question 2 options:

sample mean of difference scores will equal zero

population mean of difference scores will equal zero

sample mean of difference scores will NOT equal zero

population mean of difference score will NOT equal zero

sample mean of group 1 minus the sample mean of group 2 will equal zero

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Question 3 (1 point)

Question 3 options:

Cassandra wants to examine the impact of exercise on depression. She gives 8 people a Beck Depression Inventory (BDI) to measure their baseline depression and then gives them a new intervention for a few hours each week. She then measures their BDI scores again a four months later. If she uses an alpha of .01 and does a two sided test then what will her critical t will be?

Your answer should be rounded to two decimal places. In addition, be sure you specify the sign. If it is two signs then separate the signs by a ‘/’. For example if I wanted to say plus or minus 1.5 then my answer would need to be in the following format with no extra spaces: +/-1.50

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Question 4 (1 point)

Question 4 options:

Cassandra wants to examine the impact of exercise on depression. She gives 8 people a Beck Depression Inventory (BDI) to measure their baseline depression and then gives them a new intervention for a few hours each week. She then measures their BDI scores again a four months later. Her baseline mean is 39.25 and her post-test mean is 13.125. Her standard deviation for difference scores is 17.66. What is her repeated measures t value?

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Question 5 (1 point)

Cassandra wants to examine the impact of exercise on depression. She gives 8 people a Beck Depression Inventory (BDI) to measure their baseline depression and then gives them a new intervention for a few hours each week. She then measures their BDI scores again a four months later. Her baseline mean is 39.25 and her post-test mean is 13.125. Her standard deviation for difference scores is 17.66. If she has a two-sided test with an alpha of .01 then what should her decision be?

Question 5 options:

Reject Ho

Retain Ho

Reject the pre-depression Ho but retain the post-depression Ho

Reject the post-depression Ho but retain the pre-depression Ho

Not enough information to make this determination

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Question 6 (1 point)

Question 6 options:

Cassandra wants to examine the impact of exercise on depression. She gives 8 people a Beck Depression Inventory (BDI) to measure their baseline depression and then gives them a new intervention for a few hours each week. She then measures their BDI scores again a four months later. Her baseline mean is 39.25 and her post-test mean is 13.125. Her standard deviation for difference scores is 17.66. What is her estimated Cohen’s d?

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Question 7 (1 point)

Question 7 options:

Cassandra wants to examine the impact of exercise on depression. She gives 8 people a Beck Depression Inventory (BDI) to measure their baseline depression and then gives them a new intervention for a few hours each week. She then measures their BDI scores again a four months later. Her baseline mean is 39.25 and her post-test mean is 13.125. Her standard deviation for difference scores is 17.66. What is her r-squared?

Please put your answer into a percentage form.

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Question 8 (1 point)

Question 8 options:

Santiago found that his t-statistic was 5.24 and he had a sample of 40 people. What is his r-squared?

Please put your answer into a percentage form.

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The focus on difference scores

The focus on using population means from the alternative hypothesis as opposed to the population mean from the null hypothesis

The focus on making sure that you are using multiple samples

The new formula for figuring out the mean

Actually the format of the repeated measures t-test is completely different from all other t-test. There is no comparison among them.

Explanation / Answer

Solution:-

1) The focuses on differnce scores.

2) The population mean of differnces scores will equa zero.

3) tcritical = 3.499

D.F = n - 1

D.F = 7

Alpha = 0.01

tcritical = 3.499

4) tvalue = 4.184

s = sqrt [ ((di - d)2 / (n - 1) ]

s = 17.66

SE = s / sqrt(n)

S.E = 6.24375

DF = n - 1 = 8 -1

D.F = 7

t = [ (x1 - x2) - D ] / SE

t = 4.18

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