A p chart is used to monitor the number of riding lawn mowers produced. The numbers that are sent back for rework because they did not pass inspection are Day Number Produced Number Rejected 1 400 23 2 480 18 3 475 24 4 525 34 5 455 17 6 385 17 7 372 12 8 358 19 9 395 24 10 405 29 11 385 16 12 376 19 13 395 23 14 405 14 15 415 25 16 440 34 17 380 26 18 318 19 Enter the data into a spreadsheet and compute standardized Z values for a p chart.
Graph the Z values. Is this process in control?