22. Constructing a Confidence Interval The stemplot below lists the ages of applicants who were successful in winning promotion (based on data from “Debating the Use of Statistical Evidence in Allegations of Age Discrimination,” by Barry and Boland, American Statistician, Vol. 58, No. 2). Assume that the sample is a simple random sample and construct a 95% confidence interval estimate of the mean age of all such successful people. Compare the result to the confidence interval for the ages of those who were not successful (see the example in this section).

mg>m3.

mg>m3 Electric snow thrower maximum heart rates: n 5 10, x 5 124, s 5 18.

Manual snow shoveling maximum heart rates: n 5 10, x 5 175, s 5 15.

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