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12#
发表于 2011-7-11 19:06
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alta168 Wrote:
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> Sorry, I am confused. Refering to Question 1
> mentioned above & Exhibit 5 on P.176 of CFAI
> text,Vol6 :
>
> What is meant by "the confidence intervals for a
> quality control charts were widened" here ? Does
> it mean : the confidence interval is increased
> (e.g., from 80% to 90%) ? And in this case, will
> the funnel-shaped lines (upper/lower envelopes) of
> quality control charts be more far away from
> X-axis (horizontal line) ?
I think "the confidence intervals for a quality control charts were widened" shall mean that the confidence intervals : e.g., changed from 90% to 80%, and the funnel-shaped lines of quality control charts be more far away from X-axis (horizontal line).
Anyone else can confirm ? |
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