In a random sample of 974 patients in a hospital emergency room, the mean wait time was 48.5 minutes with a standard deviation of 3.4 minutes. Answer the following questions. If it is not possible to answer a question, use NA as your answer.

What is the population mean wait time for all emergency room patients at this hospital?

What is the point estimate for the population mean?

What is the population standard deviation?

What is the sample standard deviation?