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A Quality Analyst Wants to Construct a Control Chart for Determining

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A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are in control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results
A quality analyst wants to construct a control chart for determining whether three machines, all producing the same product, are in control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results   What is the sample mean for machine #1? A) 15 B) 16 C) 17 D) 21 E) 23
What is the sample mean for machine #1?


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