Question: Suppose you have collected four samples, where each sample has six observations. The sample mean and range of each sample are as follows: Sample Sample

Suppose you have collected four samples, where each sample has six observations. The sample mean and range of each sample are as follows:

Sample Sample Mean Sample Range
1 9 3
2 10 2
3 8 1
4 9 2

(a) What is the upper control limit for the R-chart? Answer with three decimal places.

(b) What is the lower control limit for the x(x-bar)-chart? Answer with three decimal places.

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