Refer to the serum cholesterol data on 350 subjects under three diet regimens (SERUMCHO).

A total of 347 adult males between the ages of 30 and 65 participated in a study to investigate the relationship between the consumption of meat and serum cholesterol levels. Each subject ate beef as his only meat for a period of 20 weeks, pork as his only meat for another period of 20 weeks, and chicken or fish as his only meat for another 20-week period. At the end of each period serum cholesterol determinations mg ð Þ =100ml were made on each subject. Select a simple random sample of 10 subjects from the population of 350.

Use two-way analysis of variance to determine whether one should conclude that there is a difference in population mean serum cholesterol levels among the three diets. Let a ¼ :05. Compare your results with those of your classmates.