The Data shown in Table E2.25 are from a study that compares adoles- cents who have bulimia to healthy adolescents with similar body com- positions and levels of physical activity. The table provides measures of daily caloric intake (kcal/kg) for random samples of 23 bulimic adoles- cents and 15 healthy ones.
TABLE E2.25
|
Bulimic Adolescents
|
Healthy Adolescents
|
|
15.9
|
17.0
|
18.9
|
30.6 40.8
|
|
16.0
|
17.6
|
19.6
|
25.7 37.4
|
|
16.5
|
28.7
|
21.5
|
25.3 37.1
|
|
18.9
|
28.0
|
24.1
|
24.5 30.6
|
|
18.4
|
25.6
|
23.6
|
20.7 33.2
|
|
18.1
|
25.2
|
22.9
|
22.4 33.7
|
|
30.9
|
25.1
|
21.6
|
23.1 36.6
|
|
29.2
|
24.5
|
|
23.8
|
(a) Calculate and compare the means.
(b) Calculate and compare the variances.