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Statistics and Probability

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Moderate

Test of Two Ball Bearings Processes

STATS-KRGD8V

A national manufacturer of ball bearings is experimenting with two different processes for producing precision ball bearings. It is important that the diameters be as close as possible to an industry standard. The output from each process is sampled and the average error from the industry standard is calculated. The manager is interested in determining whether there is evidence that the two processes yield different average errors.

The appropriate test applied to this situation is:

A

an independent sample test.

B

an $F$-statistic.

C

a goodness-of-fit test.

D

a dependent sample test.