Analysis if Family Therapy for Anorexia Data

For the Wilcoxon matched pairs signed ranks test, I used VassarStats. I entered the data as shown in the table below…

…and then clicked on Calculate. This yielded the table shown below.

This yielded z (the Wilcoxon statistic) of -2.93 which is statistically significant with p = .002. I conclude that family therapy was successful. Girls, as a group, gained 11.4 lbs.