A National Manufacturer of Ball Bearings Is Experimenting with Two

question 29

Multiple Choice

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 results are presented below:
The researcher is interested in determining whether there is evidence that the two processes yield
Different average errors. Given the following MegaStat printout, what analysis and decision can be
Made?

• A) Reject the null hypothesis and conclude the means are different.
• B) Reject the null hypothesis and conclude the means are the same.
• C) Fail to reject the null hypothesis at the 1% level of significance.
• D) Fail to reject the null hypothesis at the 5% level of significance and conclude the means are different.

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Definitions:

Scanty

Insufficient in amount or quantity; minimal or sparse.

Little

A term indicating a small size, amount, or degree of something.

Posttest

An examination or evaluation conducted after a course of study or period of training to assess what has been learned.

Instruction

The act of teaching or educating, often involving a direction or order that is to be followed.