statistics

How large a sample should be taken if the population mean is to be estimated with 99% confidence to within $72? The population has a standard deviation of $800.

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asked by Kennon
  1. mu = bar x +/- 2.58(sigma/sqrt N)
    mu is the population mean.
    bar x is the average.
    2.59 gives the 99% confidence interval.
    sigma is standard deviation. N is the number of sample. Solve for N.

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