Question: How would I use the data set attached with 30 subgroups of 6 response times (i.e. sample size is 6) by using only subgroups 1
How would I use the data set attached with 30 subgroups of 6 response times (i.e. sample size is 6) by using only subgroups 1 to 15 only to construct a Xbar & R chart?

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