A Quality Analyst Wants to Construct a Control Chart for Determining

question 127

Multiple Choice

A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results: $$\begin{array} {r } { \text { Measurements } } \\\begin{array} { l l l l l } \text { Machine } & \\\hline \# 1 & 17 & 15 & 15 & 17 \\\# 2 & 16 & 25 & 18 & 25 \\\# 3 & 23 & 24 & 23 & 22\end{array}\end{array}$$ What are the x-bar chart three-sigma upper and lower control limits?

• A) 22 and 18
• B) 23.29 and 16.71
• C) 23.5 and 16.5
• D) 23.16 and 16.84
• E) 24 and 16

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Definitions:

Direct Labor Hours

The total hours worked by employees directly involved in the production process, used in costing and pricing decisions.