Question: 1. Control charts for and s have been maintained on a process and have exhibited statistical control. The sample size is n = 6. The

1. Control charts for and s have been maintained on a process and have exhibited statistical control. The sample size is n = 6. The control chart parameters are as follows:

x bar chart S chart

UCL = 708.2 UCL = 3.420

CENTER LINE = 706 CENTER LINE = 1.738

LCL =703.8 LCL =0.052

(a) Estimate the mean and standard deviation of the process.

(b) Estimate the natural tolerance limits for the process.

(c) Assume that the process output is well modeled by a normal distribution. If specifications are 703

and 709, estimate the fraction nonconforming.

(d) Suppose the process mean shifts to 702.00 while the standard deviation remains constant. What is the probability of an out-of-control signal occurring on the first sample following the shift?

(e) For the shift in part (d), what is the probability of detecting the shift by at least the third subsequent

sample?

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