Multiple Choice
Piston rings for an automotive engine are produced by a forging process.We wish to monitor the inside diameter of the rings manufactured by this process using an 
and an s control chart.Samples of size 4 are to be taken at regular intervals,and the sample means and standard deviations are computed and plotted on the charts in time order.The target values for the inside diameter are a mean of = 75 millimeters and a standard deviation of = 0.02 millimeters.The control chart constants are (partially) reproduced below. 
What is the center line for the s chart?
A) 0.018 millimeters
B) 0.02 millimeters
C) 0.04 millimeters
D) 75 millimeters
Correct Answer:
Verified
Correct Answer:
Verified
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