Everitt, in 1994, reported on family therapy as a treatment for anorexia.There were 20 girls in a cognitive-behavior therapy condition, and they were...

Everitt, in 1994, reported on family therapy as a treatment for anorexia.There were 20 girls in a cognitive-behavior therapy condition, and they were weighted before and after treatment. The weight gains of the girls, in pounds, are shown below. The scores were obtained by subtracting the Before score from the After score, so that a negative difference represents weight loss, and a positive difference represents a gain.

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 20.9 -9.1 2.1 -1.4 1.4 -0.3