a question about 'properties of multivariate normal distributions

hello guys,

i have a statics question and looking for an answer quickly...

question;

prove that,

\(\displaystyle \mbox{if }\, Z\, \sim\, N_p\,(0,\, I),\, \mbox{ then }\, Z'\, Z\, \sim\, \chi_p^2\)

Z is a vector.

thank you.

rof said:

hello guys,
i have a statics question and looking for an answer quickly...

question;

prove that,

Z is a vector.


thank you.​

Click to expand...

First of all - the topic of your question is NOT statics - but it is STATISTICS.

Please define N_p , I and \(\displaystyle \chi_p^2\)

What are your thoughts?

Please share your work with us ...even if you know it is wrong

If you are stuck at the beginning tell us and we'll start with the definitions.

You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL:

http://www.freemathhelp.com/forum/announcement.php?f=33

yes, sorry its statistics..

actually im looking for the answer for a friend of mine.
she said she have tried for days. but cant solve this. now she has only today left for this question.. (for an assignment or something)
sorry i dont think i can provide pictures for "What have you tried?"

anyway, here is the full paper, the 5th question is what she wants.

< link to objectionable page removed >

rof said:

actually im looking for the answer for a friend of mine.

Click to expand...

Please have the friend reply with a clear statement of the definitions, from her textbook, of the variables. When she replies, please have her provide a clear statement of her thoughts and efforts so far, so we can see where she's getting stuck.

Thank you!

hello,

this thread is no longer needed now...
thank you all for taking the time to look at the question..

good luck to all..