A process is checked by inspection of random samples of six shafts after a grind

Question

A process is checked by inspection of random samples of six shafts after a grinding operation. X-bar and R charts are maintained. The operator checks the six shafts, measures them accurately, and plots the value of each individual item on an X-bar chart. Based on what he sees on the chart, he advises the department to stop the process. This decision indicates that:

Question 4 options:

1) at least one of the individual values probably is out of control. 2) the sample has provided evidence that the process is out of control. 3) the person is not using the chart correctly because he is plotting individual items. 4) the sample has provided evidence that the process is not capable. 5) None of the above.

Explanation / Answer

The correct answer is (2) ie the decision indicates that the sample has provided evidence that the process is out of control.

No estimation of process average can be made.

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