The following sample~ of screws (length in inches) were
Chapter 25, Problem 42(choose chapter or problem)
The following sample~ of screws (length in inches) were taken from an ongoing production. Assuming that the population is normal with mean 3.500 and variance 0.0004, set up a control chart for the mean, choosing a = I %, and graph the sample means on the chart. Sample No. Length 2 3 4 5 6 7 3.49 3.48 3.52 3.50 3.51 3.49 3.52 3.53 3.50 3.47 3.49 3.51 3.48 3.50 3.50 3.49
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