Standard Error calculation

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Standard Error calculation

Postby quee0849 » Fri Apr 11, 2014 3:33 pm

I see that in Ex 9.12, you calculate the standard error to be \sqrt{sample variance/N-1 } - however on pg 91 you define the standard error to be the \sqrt{variance/N}. Is this just because we have calculated the (biased) sample variance V(X)=7.38 here rather than the population variance? So presumably we have something like E(\sqrt{sample variance/N-1 }) = \sqrt{population variance/N}?
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Re: Standard Error calculation

Postby mj » Mon Apr 28, 2014 11:55 am

generally we have a sample estimate so we should proceed accordingly. It's really not worth getting worked up about in this context.
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