# Question: Assume that the mean and the standard deviation of the

Assume that the mean and the standard deviation of the difference scores in Exercise 13.6 would remain the same if we added more subjects. How many subjects would we need to obtain a t that is significant at a 5 .01 (two-tailed)? (The difference was significant at a =.05, but no at a =.01.) (We will return to this general problem in Chapter 15.)

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