Question: a . Determine the upper the lower control limits for an x bar chart and an r bar chart with a sample size of four.

a. Determine the upper the lower control limits for an x bar chart and an r bar chart with a sample size of four.
b. After the control chart was established, a sample of four observations had the following times in seconds, 185.150,192, and 178. Is corrective actions needed?
a. Determine the upper the lower control limits for an x

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