Question

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. An investigation gave the accompanying data on total body bone mineral content (in grams) for a representative sample of mothers both during breast feeding (B) and during the post-weaning period (P).

Subject	1	2	3	4	5	6	7	8	9	10
B	1,926	2,549	2,825	1,922	1,626	2,175	2,142	2,623	1,841	2,543
P	2,128	2,885	2,895	1,944	1,750	2,182	2,162	2,628	2,008	2,627

Use a 95% confidence interval to estimate the difference in mean total body bone mineral content (in g) during post-weaning and during breast feeding. (Use μ_d = μ_P − μ_B. Copy and paste into Excel, and create row of differences. If you have trouble pasting, try copying just the second and third row here. Round your answers to two decimal places. Then answer other questions on written form.)

Answer 1