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March 27, 2017

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It is known that the standard deviation for the number of minutes women spend applying makeup everyday is 17 minutes if you want to construct a 95% confidence interval for the mean amount of time women spend applying make up with a margin of error of no more than 5 mins. At least how many women must you survey

  • Statistics - ,

    95% = mean ± 1.96SEm

    1.96 SEm ≤ 5

    SEm = SD/√n

    I'll let you do the calculations.

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