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 45 defectives, machine 2 had 68 defectives, machine 3 produced 32 defectives, and machine 4 had 39 defects. For the upper and lower control limits of 062 and 034, which machine(s), if any, appear(s) to be out of control for proportion of defectives? O a. Machines 1 and 2 O b. Machines 1 and 3. O c. Machines 2 and 4. d. Machines 3 and 4 O e. None of the above

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