Question: A control chart is being used to control a manufacturing process. As part of the control a sample of five parts is taken from the

A control chart is being used to control a manufacturing process. As part of the control a sample of five parts is taken from the manufacturing process each hour of operation. Each of the five parts is measured and the dimension is recorded on the work sheet. The difference between the highest and lowest measured dimension of the five parts is plotted on the control chart. This is called which of the following values?

a. R

b. R bar

c. X

d. X bar

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