Question: 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 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

Machine Measurements
#1 17 15 15 17
#2 16 25 18 25
#3 23 24 23 22

What is the estimate of the mean of the sampling distribution for the sample mean?

Multiple Choice

  • 21

  • 23

  • 19

  • 16

  • 20

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