Question: A new production process is being contemplated for the manufacture of stainless steel bearings. Measurements of the diameters of random samples of bearingsfrom the old

A new production process is being contemplated for the manufacture of stainless steel bearings. Measurements of the diameters of random samples of bearingsfrom the old and the new processes produced the following data:

Old: 16.3 15.9 15.8 16.2 16.1 16.0 15.7 15.8 15.9 16.1 16.3

a. Can you conclude at the 5% level that one process yields a different mean size bearing than the other?

b. Can you conclude at the 5% level that the variance of the new procedure is lower than the older procedure?

Old: 16.3 15.9 15.8 16.2 16.1 16.0 15.7 15.8 15.9 16.1 16.3 16.1 15.8 15.7 15.8 15.7 New: 15.9 16.2 16.0 15.8 16.1 16.1 15.8 16.0 16.2 15.9 15.7 16.2 15.8 15.8 16.2 16.3

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