The average energy expenditures for eight elderly women were estimated on the basis of information received from a battery-powered heart rate monitor that each subject wore. Two overall averages were calculated for each woman, one for the summer months and one for the winter months (154), as shown in the following table. Let μD denote the location difference between the summer and winter energy expenditure populations. Compute yi ˆ’ xi, i = 1, 2, . . . , 8, and use the Wilcoxon signed rank procedure to test H0: μD = 0 versus H1: μD = 0 Let α = 0.15.

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Average Daily Energy Expenditures (kcal) Subject Summer, x Winter, yi 1458 1353 2209 1804 1912 1366 1598 1406 1424 1501 1495 1739 2031 934 1401 1339