The diameter of a ball bearing was measured by 12 inspectors, each using two different kinds of
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The diameter of a ball bearing was measured by 12 inspectors, each using two different kinds of calipers. The results were
(a) Is there a significant difference between the means of the population of measurements from which the two samples were selected? Use α = 0.05.
(b) Find the P-value for the test in part (a).
(c) Construct a 95 percent confidence interval on the difference in mean diameter measurements for the two types of calipers.
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