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 lower control limit for the chart? A)0 psi B)18.8 psi C)78.2 psi D)78.7 psi

Question

Quizplus · Accepted Answer

The Answer of 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 lower control limit for the chart? A)0 psi B)18.8 psi C)78.2 psi D)78.7 psi

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