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Four Samples of Three Observations Each Have Been Taken,with Actual

question 11

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Four samples of three observations each have been taken,with actual measurements (in centimetres)shown below.Construct three sigma mean and range charts,and determine if corrective action is needed.
Four samples of three observations each have been taken,with actual measurements (in centimetres)shown below.Construct three sigma mean and range charts,and determine if corrective action is needed.


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