A delineate manufacturer made a qualification to a delineate to hurry up its arefaction era. Independent sincere chance samples of 11 cans of expression A (the first delineate) and 9 cans of expression B (the qualified delineate) were chosen and applied to harmonious surfaces. The arefaction eras, in hours, were commemorative.
The abstract 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 subjoined 98% trust season was obtained for μ1 - μ2, the dissent betwixt the average arefaction era for delineate cans of expression A and the average arefaction era for delineate cans of expression B:
4.90 hrs < μ1 - μ2 < 17.50 hrs
What does the trust season allude-to about the population averages?
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