The mensurements of the drying time, in hours, of a certain brand of latex paint follow a normal distribation, Suppose 20 mensurements of the drying times are recorded. The sample mean and the standard deviation of 20 measurements is 3.77 and 0.916, respec- tively. Library Course Page (a) Construct a 90% confidence interval for the true mean measurements of the drying thos Amme that the distribution of the measurements of the drying times is appramalev normal (b) Find the 95% confidence interval for the standard deviation of measurements of the drying times.

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