Calculate an estimate of d for the comparison you made in Exercise 18.8.

Exercise 18.8

Use the protected t tests with the data in Exercise 18.1 to help you interpret the results. However this time compare the mean of the two baseline measures with the mean of the three training measures.

Exercise 18.1

Migraine headaches are a problem for many people, and one way of treating them involves relaxation therapy. A study of the effectiveness of relaxation techniques in the treatment of migraines was conducted by Blanchard, Theobald, Williamson, Silver, and Brown (1978). The data that follow are in agreement with those found by Blanchard et al. (Their study was more complex than the one examined here.) I have calculated  to save you work.

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