For 72 young girls suffering from anorexia, the Anorexia.dat file at the text website shows their weights before and after an experimental period.

Table 1.5 shows the format of the data. The girls were randomly assigned to receive one of three therapies during this period. A control group received the standard therapy, which was compared to family therapy and cognitive behavioral therapy. Download the data and fit a linear model relating the weight after the experimental period to the initial weight and the therapy.

Interpret estimates.