A gear has been designed to have a diameter of 3 inches. The standard deviation

Question

A gear has been designed to have a diameter of 3 inches. The standard deviation Is the process in control or out of control? Select all that apply. of the process is 0.3 inch. A control chart is shown. Each chart has horizontal lines of drawn at the m ean, ?, ? 2, and at ?+3?. Determine if the process shown is in control or out of control. Explain standard deviations beyond the mean. either above or below the mean. more than two standard deviations from the mean Gears B. Out of control, because there are nine consecutive points C. Out of control, because two out of three consecutive points lie D. In control, because none of the three warning signals detected a change. 2 3 4 5 6 7 8 9 10 11 Observation number

Explanation / Answer

Answer is D

In control , because none of the three warning signals detected a change

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