In the example in the text assessing the effect of family therapy on anorexic girls by the mean levels of weight gain, the difference between the independent samples design used there and the related means design used in Chapter 13 is that the independent samples design
A) compared the mean weight gained by anorexic girls in family therapy to the mean weight gained by girls in a control group.
B) compared the means of pre-therapy weights to the means of post-therapy weights.
C) assumed the weight gains of the two groups would be related.
D) assessed family therapy as a predictor of weight gain.

Question

Quizplus · Accepted Answer

The independent samples design used in the example compared the mean weight gained by anorexic girls in family therapy to the mean weight gained by girls in a control group, while the related means design used in Chapter 13 compares the means of pre-therapy weights to the means of post-therapy weights. The independent samples design assumes that the two groups are independent and not related, while the related means design assumes that the weight gains of the two groups are related. The independent samples design did not assess family therapy as a predictor of weight gain, but rather assessed the effect of family therapy on weight gain by comparing it to a control group.

In the Example in the Text Assessing the Effect of Family