Reference no: EM1318879

An experiment was conducted to compare the effectiveness of five different weight reducing agents. A random sample of 50 males was randomly divided into five equal groups, with preparation A assigned to the first group, B to the second, and so on. Each person in the experiment was given a pre-study physical and told how many pounds overweight he was. A comparison of the mean number of pounds overweight for the groups showed no significant differences. The study was then begun, with each group taking the prescribed preparation for a fixed period of time. At the end of the study period, weight losses were recorded. The data are given here.

A	12.4	10.7	11.9	11.0	12.4	12.3	13.0	12.5	11.2	13.1
B	9.1	11.5	11.3	9.7	13.2	10.7	10.6	11.3	11.1	11.7
C	8.5	11.6	10.2	10.9	9.0	9.6	9.9	11.3	10.5	11.2
D	8.7	9.3	8.2	8.3	9.0	9.4	9.2	12.2	8.5	9.9
E	12.7	13.2	11.8	11.9	12.2	11.2	13.7	11.8	11.5	11.7

A. Test for significant differences among weight losses for the five diets, and perform all pair wise comparisons using:

a. Fisher's LSD

b. Tukey's procedure

B. Which procedure in part A is most appropriate. Give reasons for your selection.