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

A quality analyst wants to construct a control chart for identifying whether four machines, all producing the same product, are under control with regard to a particular quality attribute. Accordingly, she inspected 1000 units of output from each machine, with the following results: machine 1 produced 67 defectives, machine 2 had 25 defectives, machine 3 produced 56 defectives, and machine 4 had 36 defects. For the upper and lower control limits of .058 and .029, which machine(s), if any, appear(s) to be out of control for proportion of defectives?

a. Machines 1 and 2.

b. Machines 1 and 3.

c. Machines 2 and 3.

d. Machines 2 and 4.

e. None of the above.

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