Question: 8.48 Selenium A small amount of the trace element selenium, 50-200 micrograms (jug) per day, is con- sidered essential to good health. Suppose that random

8.48 Selenium A small amount of the trace element selenium, 50-200 micrograms (jug) per day, is con- sidered essential to good health. Suppose that random samples of n = n2 = 30 adults were selected from two regions of Canada and that a day's intake of selenium, from both liquids and solids, was recorded for each person. The mean and standard deviation of the selenium daily intakes for the 30 adults from region 1 were = 167.1 and s = 24.3 g, respectively. The corresponding statistics for the 30 adults from region 2 were 2 140.9 and $217.6. Find a 95% confidence interval for the difference in the mean selenium intakes for the two regions. Interpret this interval.

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