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 is the sample proportion of defectives for machine #1?

A) .023
B) .02
C) .0115
D) .0058
E) .005

Correct Answer:

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