Question: Energy Consumption: Constructing an R Chart Use samples of size 3 by combining the first three values for each year and combining the last three

Energy Consumption: Constructing an R Chart Use samples of size 3 by combining the first three values for each year and combining the last three values for each year.

Using the eight samples of size 3, construct an R chart and determine whether the process variation is within statistical control. If it is not, identify which of the three outof-control criteria lead to rejection of statistically stable variation.

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