14. Refer to Data Set 12 on the attached Excel chart and use the amounts of electricity consumed (in k Wh) in the author’s home. Let each subgroup consist of the six amounts within the same year, so that there are eight subgroups with six amounts in each subgroup. Let each subgroup consist of the six values within a year. Construct a R chart and determine whether the process variation is within statistical control. If it is not, identify which of the three out-of-control criteria lead to rejection of a statistically stable variation.
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