The quality-control plan for a certain production process involves taking samples of size 4. The results from

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The quality-control plan for a certain production process involves taking samples of size 4. The results from the last 30 samples can be summarized as follows:
The quality-control plan for a certain production process involves taking

a. Compute the 3σ control limits for the R chart.
b. Compute the 3σ control limits for the S chart.
c. Using the sample ranges, compute the 3σ control limits for the chart.
d. Using the sample standard deviations, compute the 3σ control limits for the chart.

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