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 a Compute the 3 Iuml control limits for the R chart b Compute the 3 Iuml control limits for the S chart c Using the sample ranges, compute the 3 Iuml control limits for the chart d Using the sample standard deviations, compute the 3 Iuml control limits for the chart 30 30 30 712 5 143 7 62 5 1 1 2 1

Question: 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

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:

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

30 30 30 -712.5 143.7 =62.5 1-1 2-1

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