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Statistics

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What is the appropriate sample size for a confidence interval around the sample mean if you want a margin of error of 0.8 with 95% confidence and a population standard deviation of 12.

  • Statistics - ,

    95% = mean ± 1.96 SEm

    SEm = SD/√n

    .8 = 1.96 (12/√n)

    Solve for n.

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