Breastfeeding mothers secrete calcium into their milk Some o

Breast-feeding mothers secrete calcium into their milk Some of the calcium maycome from their bones, so mothers may lose bone mineral content Re marchers compered 47 breast-feeding women with 22 women of similar age who were neither pregnant nor lactating. They measured the percent change in the mineral content of the women?s spines over three months. A negative value indicates a loss in mineral content. Here are the data: Do the data show distinctly greater bone mineral loss among the breastfeeding women? Be sure to consider in your interpretation that a bone mineral loss is reflected by a negative value here. Follow the four-step process. State: Select the appropriate practical question. Is bone mineral loss the same between breast-feeding women and other women? Is bone mineral loss greater among the breast-feeding women? Plan: Select the most appropriate practical plan. We need to compare the distributions, including appropriate measures of center and spread. We need to compare the medians. We need to compare the means. We need to compare the first quartiles Since: Complete the following table and stemplots. Compare the two distributions using both graphs and compare these two distributions with numerical summaries. (Round your answers to one decimal place.) Compute the stemplots for BF women. (Enter numbers from smallest to largest separated by spaces. Enter NONE for stems with no values.)

Solution

State: Is bone mineral loss greater among the breast-feeeding women?

Plan: We need to compare the means.

The stem plots are as shown below:

BF Women:

Other Women:

	Mean	Min	Q1	M	Q3	Max
BF Women	-3.587	-8.3	-5.3	-3.8	-2.1	2.2
Other women	0.309	-2.2	-0.4	-0.05	1.075	2.9