EXAMPLE 13.8

A study of cardiovascular risk factors. A study of cardiovascular risk factors compared runners who averaged at least 15 miles per week with a control group described as “generally sedentary.’’ Both men and women were included in the study.⁶ The design is a 2 × 2 ANOVA with the factors group and sex. There were 200 subjects in each of the four combinations. One of the variables measured was the heart rate after six minutes of exercise on a treadmill. SAS computer analysis produced the outputs in Figure 13.4 and Figure 13.5.