A National Manufacturer of Ball Bearings Is Experimenting with Two

question 82

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 measured in millimeters. The results are presented next. The researcher is interested in determining whether there is evidence that the two processes yield different average errors. The population standard deviations are unknown but are assumed equal. If we test the null hypothesis at the 1% level of significance, what is 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.
• D)Fail to reject the null hypothesis and conclude the means are different.

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Definitions:

National Emergency

A situation of urgent crisis declared by a government, granting it the authority to implement special measures to ensure public safety and order.

Rosa Parks

An African American civil rights activist best known for her pivotal role in the Montgomery Bus Boycott by refusing to give up her seat to a white person in 1955.

Civil Rights

The rights of citizens to political and social freedom and equality, often associated with movements to end discrimination.

Montgomery, Alabama

The capital city of Alabama, known for its significant role in the American Civil Rights Movement.