Essay
Five samples were taken, with five observations each. The sample findings are listed below. The sample values represent service times in minutes. 
a. Determine the control limits for the R-chart.
b. Would you conclude the R-chart is in statistical control and proceed to develop the x-bar chart?
Correct Answer:
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a. R1 = 1.1, R2 = 1.0, R3 = 1.5, R4 = 0.7, R...View Answer
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