Calculates the P-Chart (Control chart for proportions) drawing values, center line, upper and lower control limits. Control limits are based on the normal approximation to the binomial distribution. When p is small, the normal approximation may not always be adequate. In such cases, we may use control limits obtained directly from a table of binomial probabilities. If P is small, the lower control limit obtained from the normal approximation may be a negative number. If this should occur, it is customary to consider zero as the lower control limit. 

Note The assumption is all samples have the same SampleSize.

QCPChart Method