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 sample average range based upon this limited sample?

Group of answer choices

13.0

4.33

5.4

4.2

2.0

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