Question: A small amount of the trace element selenium, 50-200 micrograms (mg) per day, is considered essential to good health. Suppose that random samples of n1

A small amount of the trace element selenium, 50-200 micrograms (mg) per day, is considered essential to good health. Suppose that random samples of n1 = n2 = 30 adults were selected from two regions of the United States and that a day's intake of selenium was recorded for each person. The mean and standard deviation of the selenium daily intakes for the 30 adults from region 1 were 1 = 167.1 and s1 = 24.3 mg, respectively. The corresponding statistics for the 30 adults from region 2 were 2 = 140.9 and s2 = 17.6 mg. Find a 95% confidence interval for the difference in the mean selenium intakes for the two regions. Interpret this interval.

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