Question

A) How many rounds of golf do those physicians who play golf play per year? A survey of 12 physicians revealed the following numbers:

5,40,15,4,31,35,19,15,18,27,11,475,40,15,4,31,35,19,15,18,27,11,47

Estimate with 91% confidence the mean number of rounds played per year by physicians, assuming that the population is normally distributed with a standard deviation of 7.

B) A personnel manager has found that, historically, the scores on aptitude tests given to applicants for entry-level positions follow a normal distribution with standard deviation 23.35 points. A random sample of 8 test scores from the current group of applicants had a mean score of 71.32 points. Based on these sample results, a statistician found for the population mean a confidence interval extending from 55.7172 to 86.9228 points. Find the confidence level of this interval. Round off your answer to two decimal places.

Answer 1

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