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 σ_A = σ_B. Find a 95% confidence interval on μ_B – μ_A where PA and /;« are mean drying times.

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Total Return Company Coca-Cola Mirage Resorts Merck Microsoft Johnson & Johnson Intel Pfizer Procter & Gamble Berkshire Hathaway S&P 500 to Investors 1986-96 1996 29.8% 27.9% 22.1% 44.5% 22.2% 43.8% 21.7% 21.9% 28.3% 11 .8% 43.3% 25.4% 24.0% 88.3% 18.1% 131.2% 34.0% 32.1% 6.2% 20.3%