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 $\mu$= 80 psi and a standard deviation of $\sigma$ = 3 psi.The control chart constants are (partially)reproduced below. What is the lower control limit for the Chart? A)71 psi B)77 psi C)83 psi D)89 psi

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The Answer of 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 $\mu$= 80 psi and a standard deviation of $\sigma$ = 3 psi.The control chart constants are (partially)reproduced below. What is the lower control limit for the Chart? A)71 psi B)77 psi C)83 psi D)89 psi

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