1) A sample of difference scores has a mean of the differences = 5. Which combin

Question

1) A sample of difference scores has a mean of the differences = 5. Which combination of factors is most likely to produce a significant difference.

A. n = 4 with a variance of = 36 for the difference scores

B. n = 4 with a variance of = 64 for the difference scores

C. n = 9 with a variance of = 36 for the difference scores

D. n = 9 with a variance of = 64 for the difference scores

2.A sample is selected from a population with = 80, and a treatment is administered to the sample. If the sample variance is s2 = 20, which set of sample characteristics is most likely to lead to a decision that there is a significant treatment effect (reject H0)?

A. M = 85 for a sample of n = 25

B. M = 85 for a sample of n = 100

C. M = 90 for a sample of n = 25

D. M = 90 for a sample of n = 100

3.As sample size increases _______

A. the value of df also increases

B. the t distribution becomes more like a normal distribution

C. the critical values of t move become smaller

D. All of the other options are true as sample size increases

4.A repeated-measures study comparing two treatments measures two scores for each individual in a sample of n = 15 participants. What is the value of df for the t statistic?

A. 14

B. 15

C. 29

D. 30

Explanation / Answer

3. As sample size increases

all of the other options are true as sample size increases is correct statement.

4. degrres of freedom = n -1 = 15 - 1 = 14;

option A ia right

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