A high paced discount store in Los Angeles has decided that it needs to monitor

the number of errors made by check-out personnel. They want to use a percent defective type of control chart with three standard deviation control limits to monitor the process. They took 10 samples with each sample containing 100 transactions

The number of transactions in error for each sample was: 9, 7, 6, 6, 7, 5, 7, 5, 9, 9

Create the control chart (p-chart) for this data and answer the following questions:

1)    What is the average (or mean) percent defectives?

2)   What are the upper and lower control limits (UCL and LCL)?

3)    Is the process in control? Why?

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