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 SX2 to save you work.

Calculate and plot the appropriate column means.

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Baseline Training Subject Week Wk Week 3 Week 4 Week 5 Subject Mean 126 124 20 25 30 30 6.8 17.4 13.0 0.8 I6 2