Question: When you have control limits for control charts, they are set at 3 sigma or 3 standard deviations from the mean. Why are they? a.

When you have control limits for control charts, they are set at 3 sigma or 3 standard deviations from the mean. Why are they? a. Take the chance down to very small for looking for issues in the process when the process is fine b. The limits are very tight c. They limits are very

Histograms show all of the following except? a. Relationship of variation over time b. Shape c. Spread d. Location

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