Suppose 40 measurements of the drying times are recorded. The sample mean and the standard deviation of 40 measurements is 3.77 and 0.946, respectively. Assuming that the measurements represent a random sample from a normal population, find a 95% confidence interval for the mean drying time. Please follow the following steps when you write the answers to get full points. (1) What is the Cl formula? (2) Why did you choose that formula? (3) Calculate and Interpret the Cl.

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