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 average of the five parts is plotted on the control chart. This is called which of the following values?

a. X

b. X bar

c. Sample average

d. Control average

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