Assume that the mean and the standard deviation of the difference scores in Exercise 13.6 would remain
Question:
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 α = .01 (two-tailed)? (The difference was significant at α = .05, but not at α = .01.) (We will return to this general problem in Chapter 15.)
Exercise 13.6
Hoaglin, Mosteller, and Tukey (1983) present data on blood levels of beta-endorphin as a
function of stress. They took beta-endorphin levels for 19 patients 12 hours before surgery and
again 10 minutes before surgery. The data are presented on the next page, in fmol/ml:
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Related Book For
Fundamental Statistics For The Behavioral Sciences
ISBN: 9781305652972
9th Edition
Authors: David C. Howell
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