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

A quality analyst wants to construct a control chart for determining whether four machines, all producing the same product, are in control with regard to a particular quality attribute. Accordingly, she inspected 1,000 units of output from each machine in random samples, with the following results

MachineTotal Defectives#123#215#329#413

What are the control chart upper and lower control limits for an alpha risk of .05 ? (Hint: the alpha level is given for 2 sides; so, each side has a half of 0.05.)

.

0.272 and .0128

.0287 and .0113

.029 and .013

.0303 and .0097

.0332 and .0068

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