Question: 4. Please solve using excel and show formulas. I make sure to give up vote to correct answers. Thanks. Thirty samples of size 4 of

4. Please solve using excel and show formulas. I make sure to give up vote to correct answers. Thanks.

4. Please solve using excel and show formulas. I

Thirty samples of size 4 of the customer waiting time at a call center for a health insurance company resulted in an overall mean of 14.7 minutes and average range of .9 minutes. Compute the control limits for x-double bar and r-bar charts

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