A process has generated the output (in ounces)

listed in file XR20064.

a. For a series of samples, each with n 5 5, construct and interpret the }x and range charts for this process.

Does it appear to be in control?

b. Given your response to part (a), is it appropriate to compute the Process Capability Index (Cpk) for this process? If so, determine the overall mean and standard deviation for all the units measured, then compute and interpret the Process Capability Index if the specification limits are USL 5 45.400 ounces and LSL 5 43.800 ounces.