Problem 1: 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. Answer the 4 questions below. 1) What is the point estimate for the mean hours per month all students at the university work 2) 95% confidence interval is 3) 99% confidence interval is 4) Type here which interval is wider. Why?

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