The Shoe Store manufactures athletic shoes. The company wants to establish a p-chart to monitor the production process using
Z = 3.00. The company has taken a sample of 50 shoes every 4 hours for a work week of five days. Since the company runs two
8-hour shifts each day, this will result in 20 samples. The sample results are as follows.
Sample Number of
Defectives Proportion
Defective
Sample Number of
Defectives Proportion
Defective
1 0 0.00 11 4 0.08
2 1 0.02 12 1 0.02
3 0 0.00 13 1 0.02
4 3 0.06 14 2 0.04
5 2 0.04 15 2 0.04
6 5 0.10 16 3 0.06
7 3 0.06 17 4 0.08
8 2 0.04 18 1 0.02
9 1 0.02 19 5 0.10
10 0 0.00 20 2 0.04
The population proportion defective is not known. Construct a p-chart to monitor this process.
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