Two different brands of latex paint are being considered for use. Drying time in hours is being measured on specimen samples of the use of the two paints. Fifteen specimens for each were selected and the drying times are as follows:

Assume the drying time is normally distributed with σA = σB. Find a 95% confidence interval on µB - µA where µA and µB are mean drying times.

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Paint A 3.5 2.7 3.9 4.2 3.6 2.7 3.3 5.2 4.2 2.9 4.4 5.2 4.0 11 34 Paint B 4.7 3D 4.5 5.5 4.0 5.3 4.3 6.0 5.2 3.7 5.5 6.2 5.1 54 4.8