Lactation promotes a temporary loss of bone mass to provideadequate amounts of calcium

Chapter 9, Problem 40

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Lactation promotes a temporary loss of bone mass to provideadequate amounts of calcium for milk production. The paperBone Mass Is Recovered from Lactation to Postweaning inAdolescent Mothers with Low Calcium Intakes (Amer. J. ofClinical Nutr., 2004: 13221326) gave the following data ontotal body bone mineral content (TBBMC) (g) for a sampleboth during lactation (L) and in the postweaning period (P). a. Does the data suggest that true average total body bonemineral content during postweaning exceeds that duringlactation by more than 25 g? State and test the appropriatehypotheses using a significance level of .05. [Note:The appropriate normal probability plot shows somecurvature but not enough to cast substantial doubt on anormality assumption.]b. Calculate an upper confidence bound using a 95% confidencelevel for the true average difference betweenTBBMC during postweaning and during lactation.c. Does the (incorrect) use of the two-sample t test to testthe hypotheses suggested in (a) lead to the same conclusionthat you obtained there? Explain.