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Bicho the Inhaler
Daedalian Member

 Posted: Tue Apr 08, 2003 9:25 pm    Post subject: 1 I can't remember my statistics training! Suppose I take two samples, consisting say of N1 and N2 individuals, and I find that M1 individuals of the N1 sample have property Q, and M2 individuals of the N2 sample have property Q. How do I determine if the difference between the two samples is significant? Is this the t-test? I don't remember exactly how to do this type of test; when the results are valid; etc. Thanks in advance.
Ghost Post
Icarian Member

 Posted: Tue Apr 08, 2003 10:41 pm    Post subject: 2 no, it's a two sample z test p=proportion with Q z=                      p1-p2                             sqrt(ppooled(1-ppooled)(1/n1+1/n2))
Ghost Post
Icarian Member

 Posted: Tue Apr 08, 2003 10:58 pm    Post subject: 3 you look up the Z value you get on a table to see the probability of result that or more extreme. You need to decide in advance how small the probability should be to be significant, usually 5% or 1%.
Bicho the Inhaler
Daedalian Member

 Posted: Wed Apr 09, 2003 12:03 am    Post subject: 4 Ha ha, that looks vaguely familiar. Thanks, RSA.
Ghost Post
Icarian Member

 Posted: Wed Apr 09, 2003 12:11 am    Post subject: 5 no problem, the stats ap is fast approaching so this stuff is at the forefront of the ol' mind
Legion
Daedalian Member

 Posted: Thu Apr 10, 2003 10:58 am    Post subject: 6 Yeah, also Excel does t-test, p-test, a-test for you! But you gotta know haow to drive the thing.
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