A researcher conducts a t test for dependent means with 10 subjects. If the esti

Question

A researcher conducts a t test for dependent means with 10 subjects. If the estimated population variance of the change scores is 20, what would the variance of the distribution of the means of change scores be?

A. 20/10=2.0
B. 20/9=2.2
C. 400/10=40.0
D. 400/9=44.4

How did you come up with the answer?

Suppose a researcher conducts a t test for dependent means in which it is predicted that there will be a decrease in unemployment from before to after a particular job-skills training program. The cutoff t needed is -1.833. The standard deviation of the distribution of means of change scores is 2.0 and the mean change score for the sample studied is an increase of 5.2. What is the t score?

A. 5.2/-1.833=-2.84
B. 2/5.2=.38
C. 5.2/2=2.60
D. 22 How did you come up with the answer? D. 22 How did you come up with the answer?

Explanation / Answer

variance of mean=expected or known population variance/ n =20/10=2 2) t = diff/ standard deviation of mean = 5.2/ 2 =2.6

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