Problem: The inner diameter in millimeters of a bearing seat in a pressure plate is a critical quality characteristic in achieving the correct press fit of a roller bearing. The following table presents the inner diameter measurement from a sample of 25 randomly selected individual pressure plates. (a) Assess process control and stability. What is the standard deviation estimate of the in control, stable process? (b) Prepare a normal probability plot of the inner diameters. At = 0.05, do the data fit a normal distribution? (c) If the hole specification is 75.000 0.035 millimeter, estimate the process capability.

75.006

75.004

75.014

75.019

75.003

74.998

75.004

75.016

75.001

75.000

75.007

74.995

75.012

75.002

75.004

75.003

75.019

75.000

74.995

75.008

74.990

75.012

75.003

75.024

75.009

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