Forty-nine items are randomly selected from a population of 500 items. The sample mean is 40 and the sample standard deviation 9. Develop a 99 percent confidence interval for the population mean? (Round your answers to 3 decimal places.) ----- sample mean = x-bar = 40 ----

ME = z*s/sqrt(n) = 2.5758*9/sqrt(49) = 3.3118 ------------------- 99% CI: 40-3.3118 < u < 40+3.3118

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Aug 3rd, 2014

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