A machining operation requires close tolerances on a certain part for automobile engines. The current specification for this measurement is 3.0 cm ± .001. The quality control procedure is to take a sample of 4 units and measure each of the parts. On the basis of past samples of size 4, x = 3.0 and R = .0020. a. Construct average and range charts for this part. b. On the basis of the following data, is the process in control? c. Is the process creating output outside of its specifications?
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