What is the estimate of the sample average range

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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:

Machine Measurements

#1 17 15 15 17

#2 16 25 18 25

#3 23 24 23 22

What is the estimate of the sample average range based upon this limited sample?

Reference no: EM132691715

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