Calcium is the most abundant and one of the most important minerals in the body. It works with phosphorus to build and maintain bones and teeth. According to the Food and Nutrition Board of the National Academy of Sciences, the recommended daily allowance (RDA) of calcium for adults is 800 milligrams. You will use a version of the datafile CALCIUM. The data is the daily calcium intake (in mg.) for a sample of people with poverty level incomes. The researchers believe that the mean daily calcium intake for poverty level income people is below the recommended 800 mg. (poor people don't get enough milk, etc.). Assume that, from previous studies, = 60 mgs.

a. What is the appropriate null and alternative hypotheses?

b. What is the appropriate test of hypothesis, a z-test or a t-test? Why?

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