Under control with regard to a particular quality attribute

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Reference no: EM13821975

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?

a. Machines 1 and 2.

b. Machines 1 and 3.

c. Machines 2 and 4.

d. Machines 3 and 4.

e. None of the above.

Reference no: EM13821975

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