Finding Confidence Intervals. In Exercises 916, assume

Chapter 7, Problem 15

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Finding Confidence Intervals. In Exercises 916, assume that each sample is a simplerandom sample obtained from a population with a normal distribution. Promotion and Age Listed below are ages of applicants who were unsuccessful in winningpromotion and ages of applicants who were successful in winning promotion (based ondata from Debating the Use of Statistical Evidence in Allegations of Age Discrimination byBarry and Boland, American Statistician, Vol. 58, No. 2). Construct 99% confidence intervalestimates of the standard deviations of the two populations from which the samples wereobtained. Compare the results. What do you conclude?Ages of Unsuccessful Applicants: 34 37 37 38 41 42 43 44 4445 45 45 46 48 49 53 53 5454 55 56 57 60Ages of Successful Applicants: 33 36 37 38 38 39 42 42 43 4344 44 44 45 45 45 45 46 46 4747 48 48 49 49 51 51 52 54

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