Homework Help: Statistics

Posted by Julio on Wednesday, June 6, 2012 at 10:02am.

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 - PsyDAG, Wednesday, June 6, 2012 at 12:59pm
95% = mean ą 1.96SEm

1.96 SEm ≤ 5

SEm = SD/√n

I'll let you do the calculations.

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