3 (2) Assume that the drying time in minutes of a new paint roughly follows a normal distribution with standard deviatio

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3 2 Assume That The Drying Time In Minutes Of A New Paint Roughly Follows A Normal Distribution With Standard Deviatio 1 (56.04 KiB) Viewed 82 times

3 (2) Assume that the drying time in minutes of a new paint roughly follows a normal distribution with standard deviation equal to 10 minutes. To estimate the mean, 12 test areas of equal size were painted and yielded an average drying time of 66.5 minutes. (a) Construct the 95% confidence interval for the true mean drying time, H. (b) How large a sample is required if we want to be 95% confident that our estimation of p is off by less than 3 minutes?