Construct 3-sigma mean and range charts
An inspector obtains four samples with three observations in each. The actual measurements (in centimeters) are shown below. She wants to construct 3-sigma mean and range charts, and determine if corrective action is needed.
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A sample of 100 flights for united airlines shows that 64 are on time. A sample of 100 flights for american shows that 80 were on time. Using these figures execute a hypothesis test at alpha=0.05 that there is no difference in the performance of t
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