The effect of exercise on the amount of lactic acid in the blood was examined in the article “A Descriptive Analysis of Elite-Level Racquetball” (Research Quarterly for Exercise and Sport [1991]: 109–114). Eight men and seven women who were attending a weeklong training camp participated in the experiment. Blood lactate levels were measured before and after playing three games of racquetball, as shown in the accompanying table.

a. Estimate the mean change in blood lactate level for male racquetball players using a 90% confidence interval.

b. Estimate the mean change for female players using a 90% confidence interval.

c. Based on the intervals from Parts (a) and (b), do you think the mean change in blood lactate level is the same for men as it is for women? Explain.

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Men Player Before 1 367SAWNI 2 4 5 8 13 20 17 13 13 16 15 16 Women After Player Before 1 2 3 4 5 6 7 18 37 40 35 30 20 33 19 11 16 13 18 14 11 13 After 21 26 19 21 14 31 20