Ashbrook Golf Course wants to estimate the mean time for a round of golf for all golfers at their course

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Ashbrook Golf Course wants to estimate the mean time for a round of golf for all golfers at their course. They wish to estimate the population mean time with a margin of error of 1.2 minutes. The standard deviation from a small pilot study is estimated at 12.15 minutes. What minimum sample size should Ashbrook use if they want to be 95% confident of the result?