Hey everyone, welcome to this lecture how to create a C chart on Minitab. This data is added on a spreadsheet and you will find it in the resources section of this lecture. You should have it by heart by now. Please download this data and paste it on Minitab choose stat, control charts, attributes charts. See, I repeat to stat, control charts, attributes charts, see in variables enter number of defects. Click see chart options.

Then click the S limits tab under display control limits at enter 123 in These multiples of the standard deviation underplays bounds on control limits. Check lower standard deviation limit bound, and enter zero. Then click the test Step. Choose perform all tests for special causes. Then click OK in each dialog box, here you go. This is the C chart.

Let's talk about its inference. Now, you will observe that the chart displays lines for one standard deviation, two standard deviations, and three standard deviations on both sides of the center line. There are two data points sample six and sample 20 that are outside the lower and upper control limits respectively. Hence, this process is out of control. You should investigate what special causes may have influenced the out of control situation That brings us to the end of this lecture. You will now go through an activity