A National Manufacturer of Ball Bearings Is Experimenting with Two

question 28

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. Assume calculated t to be +2.70; at the 0.01 level of significance what would be the decision?

• 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 and conclude the means are the same.
• D) Fail to reject the null hypothesis and conclude the means are different.
• E) None of these statements are correct.

---

Definitions:

Sympathetic

Refers to the part of the autonomic nervous system that accelerates heart rate, constricts blood vessels, and raises blood pressure.

Sympathetic

Showing feelings of pity and sorrow for someone else's misfortune; understanding between people; common feeling.

Parasympathetic

Relating to the part of the autonomic nervous system responsible for rest and digestion, counterbalancing the sympathetic nervous system.

Central

In the context of psychology or neuroscience, this could refer to central processes or systems within the brain that are crucial for various cognitive functions.