The NCAA is interested in estimating the difference in mean number of daily training hours for men and women athletes on college campuses. It wants 95 percent confidence and will select a sample of 10 men and 10 women for the study. The variances are assumed equal and the populations normally distributed. The sample results are:
| Men |
Women |
| n1 = 10 students |
n2 = 10 students |
| x1 = 2.7 hours |
x2 = 2.4 hours |
| s1 = .30 hours |
s2 = .40 hours |
Based on these data, the lower limit for the difference between population means is 0.15 hours.
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