ehat the category of this question ? i mean whether it independence or dependent

1. 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 given as follows. Paint A Paint B 3.5 2.7 3.9 4.2 3.6 4.7 3.9 4.5 5.5 4.0 2.7 3.3 5.2 4.2 2.9 5.3 4.3 6.0 5.2 3.7 4.4 5.2 4.0 4.1 3.4 5.5 6.2 5.1 5.4 4.8 Assume the drying time is normally distributed with o =0. Find a 95% confidence interval for the difference of the true average drying time between the two brands of paints