<p>do we have to know pooling variances for t tests??? cuz its not in the barrons study book. Also does anyone have any last minute study tips as in what i should memorize</p>
<p>Thanks a bunch</p>
<p>i saw it on an AP FRQ i was doing earlier, so its possible.</p>
<p>if you do pooled, just prove the variances are equal by dividing one over the other and showing that the quotient is close to 1</p>
<p>Why use pooled ever? Everything I've read said stay away from pooled.</p>
<p>i learned that you pool for 2 prop z tests, but not 2 prop z intervals.</p>
<p>What exactly is pooled?</p>
<p>basically just finding the average p & q for the 2 groups and using the result in your calculations for SE, etc</p>