Modify the data in Exercise 13.6 by shifting the entries in the 12 hour column so as
Question:
Modify the data in Exercise 13.6 by shifting the entries in the “12 hour” column so as to increase
the relationship between the two variables. Run a t test on the modified data and notice the
effect on t. (You could never do this with real data, because paired scores must be kept together,
but doing so here reveals the important role played by the relationship between variables.)
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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