Question: A quality analyst wants to construct a control chart for determining whether four machines, all producing the same product, are in control with regard to

A quality analyst wants to construct a control chart for determining whether four machines, all producing the same product, are in control with regard to a particular quality attribute. Accordingly, she inspected 1,000 units of output from each machine in random samples, with the following results:

Machine Total Defectives

#1 25

#2 15

#3 30

#4 10

  1. What are the control chart upper and lower control limits for an alpha risk of .05?
  2. For upper and lower control limits of .025 and .015, which machine(s), if any, appear(s) to be out-of-control for process proportion of defectives?

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