Question: 2. A p-chart is a control chart for attributes, used to monitor the proportion of defective items in a process. An inspector counted the number

2. A p-chart is a control chart for attributes, used to monitor the proportion of defective items in a process. An inspector counted the number of effective monthly billing statements of telephone company in each of 6 samples. Using the following information, construct a control chart. Each sample contained 20 statements. Z value is 0.02

samples	Number of defectives
1	7
2	10
3	12
4	4
5	9
6	11
total	53

Computing control limits for the fraction defective

P-bar=53/120=.44

SDp=

UCL

LCL

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