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

A quality analyst wants to construct an attribute

A quality analyst wants to construct an attribute control chart for determining whether four machines, all producing the same product, are under control with regard to a particular quality attribute. Accordingly, she Inspected 1,100 units of output from each machine in random samples, with the following results: Machine Sample Mean # of Defectives 1 23 2 15 3 29 4 13 For upper and lower control limits of 2.6% and 1.4%, which machine(s), if any, appear to be out-of-control for defectives? Multiple Choice machines 2, 3, and 4 only machine 3 only PET machines 2 and 4 only All of the machines appear to be out of control

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