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An executive is looking at the job performance resulting from two different manufacturing processes and finds...

An executive is looking at the job performance resulting from two different manufacturing processes and finds that the mean performance of process A is 83.2 and the mean performance of process B is 80.5. Why can the executive not automatically assume that process A will consistently outperform process B? Use what you know about the two kinds of variance (Between - group and Within-group) to explain your answer to this question.

Math   Statistics-And-Probability   
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