Chapter 2, Problem 18P

The data in Table 2.15 are a sample of cholesterol level: taken from 24 hospital employees who were on a standard American diet and who agreed to adopt a vegetarian die for 1 month. Semm-cholesterol measurements were mad< before adopting the diet and 1 month after. The data art j. available at cholesterol-xls at www.cengagebrain.com.

TABLE 2.15 Serum-cholesterol levels (mg/dL) before and after adopting a vegetarian diet

Some investigators believe that the effects of diet on cholesterol are more evident in people with high rather than low cholesterol levels. If you split the data in Table 2.15 according to whether baseline cholesterol is above or below the median, can you comment descriptively on this issue?