Precision Ball

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someone help! statistics question!?

A national manufacturere of ball bearings is experimenting with two different processes for prodicing precision ball bearings. It is important that the diameters be as close as possible to an industry standard. THe output from each process sampled and the mean error from the industry standard is calculated. The results are presented below:

Mean of Process A: .002mm
Mean of Process B: .0026mm

Standard Deviation of PA: .0001mm
Standard Deviation of PB: .00012mm

Sample Size of PA: 12
Sample Size of PB: 14

The engineering LEad is interested in determining whether there is evidence that the two processes yield different mean errors. Assume that the population standard deviations are equal and the Engieeer is willing to accept Type 1 Error of 5%.

Null and Alternative Hypothesis?

Significance Level?

Test Statistic?

Decision Rule?

Make a decision and interpret the results?

please someone help im stuck on this question!

There is far too much here to explain. If you send me you email address through yahoo I will send you an example of how it is done via an attachment.

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