A quality control manager at a manufacturing facility has taken 4 samples with 4 observations each of the diameter of a part.(a)

Question:

A quality control manager at a manufacturing facility has taken 4 samples with 4 observations each of the diameter of a part. (a) Compute the mean of each sample.
(b) Compute an estimate of the mean and standard devia- tion of the sampling distribution.
(c) Develop control limits for 3 standard deviations of the product diameter.
Samples of Part Diameter in Inches
4 5.8 6.2 6.1 6.0 5.9 6.0 5.9 5.9 6.0 5.9 6.0 5.9 6.1 5.9 5.8 6.1

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