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Estimate the true population mean size

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1) The number of students who belong to the dance company at each of several randomly selected small universities is shown here. Estimate the true population mean size of a university dance company with 95% confidence.

21       25       32       22       28       30       29       30       47       26

35       26       35       26       28       28       32       27       40       45

2) A pizza owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. How large should the sample be if she wishes to be accurate to within $0.15? A previous study showed that the standard deviation of the price was $0.26.

Reference no: EM131921924

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