A researcher conducts a t test for dependent means with 10 participants. If the estimated population variance of the change scores is 20, what is the variance of the distribution of the means of the change scores?
A) 20/10 = 2.0
B) 20/9 = 2.2
C) 400/10 = 40.0
D) 400/9 = 44.4
Answer: A
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