Construct a p-chart from the data in DS 16.4.1, which are the number of defective items found in random samples of n = 100 items taken at k = 30 time points.
(a) Is there any reason to believe that the process was out of control while this data set was collected?
(b) How many defective items would need to be discovered in a future sample for the process to be considered to be out of control?