16. Samples of size 5 provided the following 20 sample means for a production process that is believed to be in control. 95.72 95.24 95.18 95.44 95.46 95.32 95.40 95.44 95.08 95.50 95.80 95.22 95.56 95.22 95.04 95.72 94.82 95.46 95.60 95.78

a. Based on these data, what is an estimate of the mean when the process is in control?

b. Assuming that the process standard deviation is σ  .50, develop an control chart for this production process. Assume that the mean of the process is the estimate developed in part (a).

c. Are any of the 20 sample means outside the control limits?