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Standard Deviation: The Mean Hourly Wage

A union official wants to estimate the mean hourly wage of it's members. A random sample of 64, taken from a normal population shows the sample mean is $18.30 and the sample standard deviation is $3.25.

a. Find a 90% CI for m

b. Find a 95% CI for m

c. Find a 98% CI for m

d. Find a 99% CI for m

Solution Summary

The confidence intervals for the mean hourly wage of the members of a union are determined.