# Answer to Question #36481 in Statistics and Probability for annie

Question #36481

a) The sample standard deviation of P/E ratios for stocks listed on the Sydney Stock Ex-change is s = 7.8. Assume that we are now interested in estimating the population mean P/E ratio for all stocks listed on the Sydney Stock Exchange in July 2004. How many stocks should be included in the sample if we want a margin of error of 2? Use a 95% confidence level.

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