Homework Help: Statistics

Posted by Maureen on Monday, December 17, 2012 at 2:33am.

A computer repair service found that a random sample of 45 repair costs had a mean cost of $659. Assume that the population standard deviation is $125. Calculate the margin of error, E, for a 95% confidence interval for the population mean ľ.

Statistics - PsyDAG, Monday, December 17, 2012 at 12:22pm
95% = mean ą 1.96 SEm

SEm = SD/√n

I'll let you do the calculations.

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