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A paint manufacturer wished to compare the drying times of two different types of paint. Independent...

A paint manufacturer wished to compare the drying times of two different types of paint. Independent simple random samples of 11 cans of type A and 9 cans of type B were selected and applied to similar surfaces. The drying times, in hours, were recorded. The summary statistics are as follows. Type A - Type B TYPE Ax1=71.5 hrs vs. TYPE B x2= 68.5 hrs TYPE A s1=3.4hrs vs TYPE B s2 = 3.6 hrs TYPE A n1=11 vs TYPE B n2=9 Construct a 99% confidence interval for u1- u2 the difference between the mean drying time for paint of type A and the mean drying time for paint of type B.

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