Poverty and Dietary Calcium. Calcium is the most abundant mineral in the human body and has several important functions. Most body calcium is stored in the bones and teeth, where it functions to support their structure. Recommendations for calcium are provided in Dietary Reference Intakes, developed by the Institute of Medicine of the National Academy of Sciences. The recommended adequate intake (RAI) of calcium for adults (ages 19–50) is 1000 milligrams (mg)

per day. A simple random sample of 18 adults with incomes below the poverty level gave the following daily calcium intakes.

886 633 943 847 934 841 1193 820 774 834 1050 1058 1192 975 1313 872 1079 809 Determine and interpret a 95% confidence interval for the mean calcium intake, μ, of all adults with incomes below the poverty level.

Assume that the population standard deviation is 188 mg. (Note: The sum of the data is 17,053 mg.)