Question

The following data are from a production process that makes approximately 250 units each hour. The data were collected over a normal 12-hour shift one day. Historical data shows the proportion of defects to be 6.21%. Either use technology to accommodate the different sample sizes, or use 250 as an approximation for all of them.
Assuming the process was previously in control,
a) Calculate the center line.
b) Create a p chart for these samples.
c) Is this process out of control?


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  • CreatedMay 15, 2015
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