I have in my notes that . I also have that . I know how to derive the first part, but how the heck do we know the second thing is true? Does it come from the derivation of the first equation or... what? Help!

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- January 15th 2010, 02:09 PMgarymarkhovDetermining degrees of freedom on Chi Sq distr
I have in my notes that . I also have that . I know how to derive the first part, but how the heck do we know the second thing is true? Does it come from the derivation of the first equation or... what? Help!

- January 15th 2010, 09:38 PMmatheagle

is incomplete, I need to know what the distribution is, probably normal

then is a chi-square...

AND I'm sure you're missing an expectation, because you have a random variable equal to a constant.

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If

Then .

Flipping constants gives.... . - January 16th 2010, 07:35 AMgarymarkhov