Six Sigma Lean Black Belt Certification Questions Part 4

Question : 6 of 17

Marks: +1, -0

Why do we use averages and sigma chart for large samples instead of averages and ranges chart?

For large samples, a single extreme observation will have a significantly large effect on range, while its effect on standard deviation will be comparatively much less.
Range is a better measure of dispersion than standard deviation.
For large samples, calculation of range is laborious in comparison to standard deviation.
None of the above.

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