Population has a standard deviation
How large a sample must be taken if the population mean is to be estimated with 99% confidence to in $69? The population has a standard deviation of $908. (Round you answer up to the nearest whole number.)
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Compute the estimate for the standard error of difference between two independent means for s1^2 = 17, s2^2 = 10, n1 = 30, and n2 = 26. (Give your answer correct to two decimal places.)
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As the quality control expert,you want to determine the mean thickness of optical lenses produced by your firm. A sample of 120 lenses reveals the mean of .52 millimeter (mm).
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A local newspaper conducts a poll of 100 randomly selected adults to find out President Obama's job approval rating. A CNN/USA-Today study also conducts the poll of 1,010 randomly chosen adults. If his actual approval rating is 54%, which poll is
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