Homework SourseBreastfeeding mothers secrete calcium into their milk Some o
Breast-feeding mothers secrete calcium into their milk. Some of the calcium may come from their bones, so mothers may lose bone mineral. Previous research shows that the average percent change in mineral content for breast-feeding mothers is µ = 4% with standard deviation = 2.5%. Researchers suspect that mothers who drink at least 8 ounces of milk per day while breastfeeding (milk-drinking mothers) lose less bone mineral. They measured the percent change in mineral content of the spines of 52 milk-drinking mothers during three months of breastfeeding.
Data
(a) Consider the question: Do milk-drinking mothers lose less bone mineral than all breast-feeding mothers? State the null and alternative hypotheses in terms of mean percent change µ in mineral content.
(b) Find the z test statistic.
(c) What is the P-value for your z?
(d) What do you conclude about the population of milk-drinking mothers?
| -3.5 | -2.4 | -3.9 | -3 | 0.3 | -4.6 | -2.4 | -4.7 | -2.5 |
| -0.6 | -5.6 | -8.2 | -2 | -6.7 | -4.2 | 2.3 | -7.9 | -3.2 |
| -0.9 | -6.4 | -1.9 | -5.2 | -5.6 | -6.9 | -1.9 | -6.2 | -0.6 |
| -2.9 | -3.7 | -5.1 | -1.9 | -2 | -5.2 | -4.3 | -3.2 | -7.1 |
| -5.1 | -5 | -3.9 | -5.7 | -2.4 | -0.2 | -6.1 | -6.7 | 1.6 |
| -0.1 | -2.4 | -0.6 | -5.5 | -0.6 | -2.3 | -4.9 |
Solution
