Parts Manufactured by an Injection Molding Process Are Subjected to a Compressive

question 71

Multiple Choice

Parts manufactured by an injection molding process are subjected to a compressive strength test.We wish to monitor the compressive strength of the parts manufactured by this process using both and s charts.Samples of size 9 are to be 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 target values for the compressive strengths are a mean of  = 80 psi and a standard deviation of  = 3 psi.The control chart constants are (partially) reproduced below. Suppose at the time of sample 10,we observe a mean of 85 psi.What should we do?

• A)Declare the process out of control.
• B)Continue sampling-the process is still in control.
• C)Continue sampling,but increase the sample size to 16.The process is barely in control.
• D)Continue sampling,but reduce the sample size to 4.The process is well in control.

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Definitions:

Blood Pressure

The pressure exerted by circulating blood upon the walls of blood vessels, a critical indicator of cardiovascular health.

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Automatic, involuntary responses to stimuli, which occur without conscious thought, designed to protect the body and maintain homeostasis.

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