Consider the individuals measurement data shown inTable6E.31. (a) Estimate Ï using the average of the moving ranges

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Consider the individuals measurement data shown inTable6E.31.
Consider the individuals measurement data shown inTable6E.31. 
(a) Estimate σ

(a) Estimate σ using the average of the moving ranges of span two.
(b) Estimate σ using s/c4.
(c) Estimate σ using the median of the span-two moving ranges.
(d) Estimate σ using the average of the moving ranges of span 3, 4,..., 20.

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