The sample means were calculated for 40 samples of size n = 5 for a process that was jud...

The sample means were calculated for 40 samples of size n = 5 for a process that was judged to be in control. The means of the 40 values and the standard deviation of the combined 200 measurements were = 155.9 and s = 4.3, respectively.

a. Use the data to determine the upper and lower control limits for an ̅x chart.

b. Construct an ̅x chart for the process and explain how it can be used.