Question: need to solve this, help pls IV. The average length of stay in a hospital for the entire population of a city is 5.4 days.

need to solve this, help pls

IV. The average length of stay in a hospital for the entire population of a city is 5.4 days. A new research on a sample of 125 patients obtains a sample mean of 4.9 days and a sample standard deviation of 2.1. (5 pts) Conduct a two-tailed test to determine whether the sample mean is significantly different from the population mean at a = .05

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