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.

Baseline Training Subject Subject Week 1 Week 2 Week 3 Week 4 Week 5 Mean 1 21 22 8 6 6 12.6 2 20 19 10 4 9 12.4 3 7 5 5 4 5 5.2 4 25 30 13 12 4 16.8 5 30 33 10 8 6 17.4 6 19 27 8 7 4 13.0 7 26 16 5 2 5 10.8 8 13 4 8 1 5 6.2 9 26 24 14 8 17 17.8 Weekly 20.78 20.00 9.00 5.78 6.78 12.47 Means Grand Mean  12.47 ©X  561 ©X2  10.483 Calculate and plot the appropriate column means.