Attempt Results Entered Answer Preview Result (21.1067484608,26.8932515392) (21.

Question

Attempt Results Entered Answer Preview Result (21.1067484608,26.8932515392) (21.1067484608, 26.8932515392) incorrect The answer above is NOT correct. (1 point) How many rounds of golf do those physicians who play golf play per year? A survey of 12 physicians revealed the following numbers: 7, 44, 17, 4, 34, 35, 22, 13, 17, 29, 13, 53 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. Note: For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits. Confidence Interval = (21.1067484608, 26.893

Explanation / Answer

Mean = 24

At 91% confidence interval the critical value is 1.7

The confidence interval is

Mean +/- z* * SD/sqrt(12)

= 24 +/- 1.7 * 7/sqrt(12)

= 24 +/- 3.435

= 20.565, 27.435

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