1. A machine that grinds valvesto length was moved from one location to another

Question

1.       A machine that grinds valvesto length was moved from one location to another on the shop floor.10 random samples taken before the move had a sample mean of 20.00mm and standard deviation of 0.010 mm. and 15 samples measuredafter the move had a sample mean of 19.99 mm and standard deviationof 0.014. Assume that the finished valve lengths are normallydistributed.

a.       The production manager seesno reason why the move would affect process variability, but wantsthis verified. Set up and perform the appropriate test.

b.       Is there evidence that themachine might need recalibration?

Explanation / Answer

I dont quite understand what is meant by "Set up and perform the appropriate test." This is what I want help with, how to explain this using probability instead of English answers. Thanks.

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