Asked by Maureen

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 µ.

Answers

Answered by PsyDAG
95% = mean ± 1.96 SEm

SEm = SD/√n

I'll let you do the calculations.
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