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A paint manufacturer wants to determine the average drying time of a new interior wall paint. For a random sample of 12 test areas of

A paint manufacturer wants to determine the average drying time of a new interior wall paint. For a random sample of 12 test areas of equal size, he obtained a mean drying time of 66.3 minutes with a standard deviation of 8.4 minutes. Assume that the population of drying time is normally distributed. A 95% confidence interval for the true mean drying time is closest to

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