Mathematics, 06.08.2021 16:30 ciaotaylor

A random sample of 81 students at a local university showed that they work an average of 100 hours per month. The population standard deviation is known to be 27 hours. Required:
a. What is the point estimate for the mean hours per month all students at the university work?
b. 95% confidence interval is :
c. 99% confidence interval is:

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