Homework Help: statistics

Posted by katie on Tuesday, April 3, 2012 at 8:31am.

A researcher wishes to estimate the mean weekly wage of the several hundreds of workers employed
     by a certain firm within plus or minus 20USD and with a 99% degree of confidence.  From past
     experience, the researcher knows that the weekly wages of these employees are normally distributed
     with a standard deviation of 40USD. What is the minimum sample size required?         [

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