11.31 Breast feeding sometimes results in a temporary loss of bone mass as calcium is depleted in the mother’s body to provide for milk production. The paper “Bone Mass Is Recovered from Lactation to Postweaning in Adolescent Mothers with Low Calcium Intakes”

(American Journal of Clinical Nutrition [2004]: 1322–

1326) gave the accompanying data on total body bone mineral content (g) for a sample of mothers both during

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breast feeding (B) and in the postweaning period (P). Do the data suggest that true average total body bone mineral content during postweaning is greater than that during breast feeding by more than 25 g? State and test the appropriate hypotheses using a significance level of .05. Subject 1 2 3 4 5 6 B 1928 2549 2825 1924 1628 2175 P 2126 2885 2895 1942 1750 2184 Subject 7 8 9 10 B P 2114 2621 1843 2541 2164 2626 2006 2627