Find Necessary Sample Size

Discussion in 'Calculator Requests' started by jaffar, Nov 12, 2016.

  1. jaffar

    jaffar New Member

    The monthly earnings of a group of business students are are normally distributed with a standard deviation of 545 dollars. A researcher wants to estimate the mean monthly earnings of all business students. Find the sample size needed to have a confidence level of 95% and a margin of error of 128 dollars.

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