In a study of weight loss, two educational methods were tested to see if they resulted in the same weight loss among the subjects. One method was called the standard method since it involved lectures on both eating and exercise. In addition to lectures, the experimental method included daily reporting of dietary intake by e-mail followed by return comments the same day. After a 1-month period, subjects were rated as to whether they met their goals for weight loss.
|
Goal
|
Treatment
|
|
|
Experiment
|
Standard
|
Total
|
|
Met
|
28
|
13
|
41
|
|
Not met
|
24
|
37
|
61
|
|
Total
|
52
|
50
|
102
|
(a) Test whether the same proportion of the two treatment groups met their goals for weight reduction.
(b) Compute the relative risk of meeting their goals for the experimental and the control groups.
(c) Compute the odds ratio of meeting their goals for the two groups and give 95% confidence intervals.