A paint manufacturer made a modification to a paint to speed up its drying time. Independent simple ...

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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 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 ?1 - ?2, 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 < ?1 - ?2 < 17.50 hrs What does the confidence interval suggest about the population means? Select one: