Question: Lactation and bone loss. A study compares changes in bone density in 22 women who are neither pregnant nor breastfeeding to that of 47 comparably

Lactation and bone loss. A study compares changes in bone density in 22 women who are neither pregnant nor breastfeeding to that of 47 comparably aged women who are breastfeeding. Table 12.13 lists percent changes in bone mineral content in the spines of these women.

(a) Compare these groups with back-to-back stemplots on a common stem. How do the groups differ? Does either group show a major departure from Normality?

(b) Calculate the 95% confidence interval for the mean difference in bone loss in the two groups. Discuss your finding.

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