Chapter 2, Problem 16P

The data in Table 2.15 are a sample of cholesterol levels taken from 24 hospital employees who were on a standard American diet and who agreed to adopt a vegetarian diet for 1 month. Serum-cholesterol measurements were made before adopting the diet and 1 month after. The data are available at cholesterol.xls at www.cengagebrain.com.

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

Compute the median change in cholesterol.