Apaint 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 hrs x2 = 65.1 hrs s1 = 4.5 hrs s2 = 5.1 hrs n1 = 11 n2 = 9 the following 98% confidence interval was obtained for μ1 - μ2, the difference between the mean drying time for paint cans of type a and the mean drying time for paint cans of type b: 4.90 hrs < μ1 - μ2 < 17.50 hrs what does the confidence interval suggest about the population means?