A paint manufacturer wants to determine the average drying time of a new interior wall paint. If for 12 test areas of equal size he
A paint manufacturer wants to determine the average drying time of a new interior wall paint. If for 12 test areas of equal size he obtained 'a mean drying time of 63 mmutes and a standard deviation of 8.4 minutes, construct a 95% condence Interval for the true mean u
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