A Quality Analyst Wants to Construct a Control Chart for Determining

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: $$\begin{array} { c c } \text { Machine } & \text { Total Defectives } \\\hline \# 1 & 23 \\\# 2 & 15 \\\# 3 & 29 \\\# 4 & 13\end{array}$$
What are the control chart upper and lower control limits for an alpha risk of .05?

A) .0272 and .0128
B) .0287 and .0113
C) .029 and .013
D) .0303 and .0097
E) .0332 and .0068

Correct Answer:

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