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. 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? Calculate the 95% confidence interval for the mean difference in bone loss in the two groups. Discuss your findings. 290CHAPTER 12COMPARING INDEPENDENT MEANSTABLE 12.13 Percent change in bone mineral content over three months in the spines of women.Controls0.00.9-0.21.01.72.9-0.61.1-0.12.40.31.2-1.6-0.1-1.50.7-0.42.2-0.4-0.4-2.2-0.1Breastfeeders-2.7-0.8-5.3 -8.3 --2.1-6.8-4.3-4.7-2.5 -4.9-1.0-6.5-1.8-5.2-5.7-7.0-2.22.2-7.8-3.1-3.0-3.6-5.2-2.0-2.1-5.6-4.4-3.3-6.5-1.0-4.9-4.7-3.8-5.9-2.5-0.3-6.2-6.81.7-4.00.3-2.30.4-5.30.2-2.2-5.1Data from Y axis of Figure 3 in Laskey, M. A., Prentice, A., Hanratty, L. A., Jarjou, L. M., Dibba,B., Beavan, S. R., et al. (1998). Bone changes after 3 mo of lactation: Influence of calcium intake,breast-milk output, and vitamin D-receptor genotype. American Journal of Clinical Nutrition, 67(4),685-692.Data are stored online in the file LACTATION.SAV.

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Description: 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. Compare

1) The stem and leaf plot is Control Breast-feeders -8 3 -7 8,0 -6 8,8,5,5,2 -5…

Answered: Controls 2.4 0.0 0.9 -0.2 1.0 1.7 2.9…

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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.

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?

Calculate the 95% confidence interval for the mean difference in bone loss in the two groups. Discuss your findings.

290
CHAPTER 12
COMPARING INDEPENDENT MEANS
TABLE 12.13 Percent change in bone mineral content over three months in the spines of women.
Controls
0.0
0.9
-0.2
1.0
1.7
2.9
-0.6
1.1
-0.1
2.4
0.3
1.2
-1.6
-0.1
-1.5
0.7
-0.4
2.2
-0.4
-0.4
-2.2
-0.1
Breastfeeders
-2.7
-0.8
-5.3 -8.3 --2.1
-6.8
-4.3
-4.7
-2.5 -4.9
-1.0
-6.5
-1.8
-5.2
-5.7
-7.0
-2.2
2.2
-7.8
-3.1
-3.0
-3.6
-5.2
-2.0
-2.1
-5.6
-4.4
-3.3
-6.5
-1.0
-4.9
-4.7
-3.8
-5.9
-2.5
-0.3
-6.2
-6.8
1.7
-4.0
0.3
-2.3
0.4
-5.3
0.2
-2.2
-5.1
Data from Y axis of Figure 3 in Laskey, M. A., Prentice, A., Hanratty, L. A., Jarjou, L. M., Dibba,
B., Beavan, S. R., et al. (1998). Bone changes after 3 mo of lactation: Influence of calcium intake,
breast-milk output, and vitamin D-receptor genotype. American Journal of Clinical Nutrition, 67(4),
685-692.
Data are stored online in the file LACTATION.SAV.

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