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there is a graph that says something like 99.7% of observations (for a norm dist) fall w/in + 3 SD of the mean…
it just confused me bc a lot of the quant questions refer to the use of 99% conf interval and + 2.575…
the .7% must be represented by the .425 SD difference …
hopefully that helped a little bit. |
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发表于 2013-4-2 11:39
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