I know I got this correct but it was a complete guess. I am unsure how to figure this out.

A paint manufacturer made a modification to a paint to speed up its drying time. Independent simple random samples of 11 cans of type A (the original paint) and 9 cans of type B (the modified paint) were selected and applied to similar surfaces. The drying times, in hours, were recorded. The summary statistics are as follows. Type A Type B X1 = 76.3 hr X2 = 65.1 hr S1 = 4.5 hr $2 = 5.1 hr n1 = 11 n2 = 9 The following 98% confidence interval was obtained for H1 - H2, the difference between the mean drying time for paint cans of type A and the mean drying time for paint cans of type B. What does the confidence interval suggest about the population means? 4.90 hr