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Three STATS Problems

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Question;1. In a study of the income of U.S. factory workers, a random sample of 100 workers shows a sample mean of \$35,000. Assume that the population standard deviation is \$4,500, and that the population is normally distributed.A) Compute the 90%, 95% and 99% confidence intervals for the unknown population mean.B) Briefly discuss what happens to the width of the interval estimate as the confidence level increases. Why does this seem reasonable?2. In a study of the starting salary of college graduates with degrees in Accounting, a random sample of 80 graduates shows a sample mean of \$36,000 and a sample standard deviation of \$2,500. Assume that the population is normally distributed.A) Compute and explain a 95% confidence interval estimate of the population mean starting salary for Accounting graduates.3. A telephone poll of 950 American adults asked "where would you rather go in your spare time?" One response, by 300 adults, was "a movie". Compute and explain a 95% confidence interval estimate of the proportion of all American adults who would respond "a movie".

Paper#61929 | Written in 18-Jul-2015

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