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

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 15 defective items, machine 2 had 38 defective items, machine 3 produced 12 defective items, and machine 4 had 45 defective items. For the upper and lower control limits of .042 and .014, which machine(s), if any, appear(s) to be out of control for proportion of defectives? a. Machines 1 and 2 b. Machines 2 and 3. c. Machines 1 and 3. d. Machines 3 and 4. e. None of the above

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