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missing stats

ok, so i get why z-scores are positive and negative, but how exactly do you compute them? ps - i fucking hate my statistics book's authors. (actually, what i really hate is that my prof and my text don't talk about anything using the same terminology.)

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( 5 comments — Say Something )
quarantine
Oct. 1st, 2004 11:49 am (UTC)
To convert X-values into z-scores, here's what you do.

A z-score equals X - the mean over the standard deviation.

To change a z-score back into an X-value, it's the mean + (z-score times standard deviation)
shakewell
Oct. 1st, 2004 11:52 am (UTC)
domoo arigato gozaimas!
i knew you would come to my aid.
quarantine
Oct. 1st, 2004 11:54 am (UTC)
Re: domoo arigato gozaimas!
No problem. If you need any other help, let me know, since it seems like we're doing the same stuff in our classes.
aileenhaligh
Oct. 1st, 2004 01:21 pm (UTC)
oh lordy, statistics
i remember my teacher changing the terminology from the book too. and he gave different formulas. math's not my thing, my teacher sucked, and it was a night class. so, i wish you much better luck with it than i had! it really wouldn't have been bad if i had tried harder, but it's hard to make yourself do something you really don't like. i know some people in the class really liked it.
good luck=)
shakewell
Oct. 2nd, 2004 08:03 am (UTC)
=)
thanks, rea! now that i'm actually reading the book, i'm able to connect what i picked up in lecture to what the text covers. i wish i'd thought to try reading when i was doing the homework. i just kept thinking, "i've never even heard of a fucking z-score!"
( 5 comments — Say Something )

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