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Apply the nonpooled t-interval procedure to obtain the required confidence interval. You may assume that the

Apply the nonpooled t-interval procedure to obtain the required confidence interval. You may assume that the

assumptions for using the procedure are satisfied.

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 AType B
X1 = 74.3X2 = 64.5
s1 = 4.5s2= 5.1
n1 = 11n2 = 9



Determine a 98% confidence interval for the difference,  between the mean drying time for type A and the mean drying time for type B.

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