In Exercise 5.21 we saw, among other things, the weight gain of each of 29 anorexic girls who received cognitive behavioral therapy. What null hypothesis would likely be testing in this situation?

 Exercise 5.21

Everitt, as reported in Hand et al. (1994), presented data on the amount of weight gained by 72 anorexic girls under one of three treatment conditions. The conditions were Cognitive Behavior Therapy, Family Therapy, and a Control group who received no treatment. The data follow, and are available on the Web as Ex5.21.dat:

Transcribed Image Text:

Cog. 1.7 0.7 -0.1 -0.7 -3.5 14.9 3.5 17.1 -7.6 1.6 11.7 6.1 1.1 -4.0 Behav. 20.9 -9.1 2.1 -1.4 1.4 -0.3 -3.7 -0.8 2.4 12.6 1.9 3.9 0.1 15.4 -0.7 Family 11.4 11.0 5.5 9.4 13.6 -2.9 -0.1 7.4 21.5 -5.3 -3.8 13.4 13.1 9.0 3.9 5.7 10.7 Control -0.5 -9.3 -5.4 12.3 -2.0 -10.2 -12.2 11.6 -7.1 6.2 -0.2 -9.2 8.3 3.3 11.3 0.0 -1.0 -10.6 -4.6 -6.7 2.8 0.3 1.8 3.7 15.9 -10.2