DS 16.3.2 contains the sample means i and the sample ranges ri of a variable measurement based upon samples of size n = 5, which are collected at k = 25 points in time.
(a) Use this data set to construct an -chart and an R-chart.
(b) Is there any evidence that the process was out of control while the data values were collected? Which samples should be removed from the data set?
(c) Construct control charts that can be employed to monitor future measurements.