An alternative to the p chart for the fraction defective is the np chart for number defe...

An alternative to the p chart for the fraction defective is the np chart for number defective. This chart has UCL = + and the number of defectives from each sample is plotted on the chart. Construct such a chart for the data of Example 16.6. Will the use of an np chart always give the same message as the use of a p chart (i.e., are the two charts equivalent)?