The data below are taken from a study that compares adolescents who have bulimia to adolescents without bulimia who have similar body compositions and levels of physical activity. The data consist of measures of daily caloric intake for random samples of 23 bulimic adolescents and 15 adolescents without bulimia [72].

(a) Test the null hypothesis that the median daily caloric intake of the population of individuals suffering from bulimia is equal to the median caloric intake of the pop- ulation which does not have bulimia. Conduct a two-sided test at the 0.

05 level of significance.

(b) Do you believe that adolescents with bulimia require a lower daily caloric intake than do nonbulimic adolescents? Explain.

Daily Caloric Intake (kcal/kg) Bulimic Nonbulimic 15.9 18.9 25.1 20.7 30.6 16.0 19.6 25.2 22.4 33.2 16.5 21.5 25.6 23.1 33.7 17.0 21.6 28.0 23.8 36.6 17.6 22.9 28.7 24.5 37.1 18.1 23.6 29.2 25.3 37.4 18.4 24.1 30.9 25.7 40.8 18.9 24.5 30.6