Multiple Choice
Parts manufactured by an injection molding process are subjected to a compressive strength test.We monitor the compressive strength of the parts manufactured by this process using an and an s control chart.Samples of size 9 are taken at regular intervals,and their mean compressive strength (in psi = pounds per square inch) and standard deviation are plotted on the charts in time order.The overall mean of the sample means is
= 81.2 psi,and the mean of the sample standard deviations is
= 2.9 psi.The control chart constants are (partially) reproduced below.
What is the center line for the s chart?
A) 2.8 psi
B) 2.9 psi
C) 3 psi
D) 5.0 psi
Correct Answer:

Verified
Correct Answer:
Verified
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