Question: A Quality Analyst wants to construct a p chart for determining whether four machines, all producing the same product, are under control with regard to

A Quality Analyst wants to construct a p chart for determining whether four machines, all producing the same product, are under 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:

MachinenNumber of Defectives #11,00023 #21,00015 #31,00029 #41,00013

. For upper and lower control limits of 0.028 and 0, which machine(s), if any, appear(s) to be out-of-control for process proportion of defectives?

A. Machine #3

B. Machine #4

C. Machines #3 and #4

D. Machines #2 and #3

E. None of the machines

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