<p>Someone asked earlier to differentiate among different tests…</p>
<p>Z Test: Used when you’re asked with averages or means and you know standard deviation of the population</p>
<p>T Test: Used when you’re asked with averages or means but you DO NOT know standard deviation of the population</p>
<p>1/2-Prop Z Test: Used when they’re asking about proportions</p>
<p>Chi Sq tests: See above posts</p>
<p>Well…
if p1=the candidate’s initial popularity
p2=the candidate’s popularity at a recent date</p>
<p>and you’re testing for whether there was a decrease…p2 would have to be less than p1 and therefore,
p1-p2>0</p>
<p>almost 1 more hour! Get pumped</p>
<p>Oh gosh, that totally makes sense!
I don’t know why I didn’t see that.</p>
<p>Do you guys think that knowledge linear regression tests will be needed? I know how to do linear regression lines (y=a+bx), but I have little to no clue about the test.</p>
<p>what did you guys think? I thought MC was medium-hard, while FRQ was easy.</p>
<p>part b of 6 on the free response was tricky… anyone know what the answer is</p>
<p>.25(1-k)+k</p>
<p>The exam is amazingly easy…but I made a careless mistake and got the last question wrong…Sadly</p>
<p>for part d, to build an interval around k, .28=.25+.75k, k=.04, is that what you were supposed to do?</p>
<p>Exam went good. I thought I was going to fail cause I didn’t read the book. #4 was the hardest for me.</p>
<p>Did anyone actually know the answer to the last question? I did.</p>
<p>Ughh, if I had the right answer but simplified incorrectly by accident, do I get points off? I’m sooo stupid. Forgot a + sign :/</p>
<p>number 6 raped me, and so did the stupid segmented bar graph</p>
<p>FOr one of the frq did you guys use r^2 or r^2 (adj)</p>
<p>thank god i only need a 3</p>
<p>I didn’t even notice, but I just used the r^2 at the bottom.</p>
<p>its the regular r^2 not the r^2 adjusted</p>
<p>thought the test was fair, a couple of things i was unsure of in the multiple choice and question 6 part d was interesting to say the least…</p>
<p>thinking I got a 5, but would not be surprised with a 4. do the p-value on that ;)</p>
<p>How do u do that last one? I have no idea… do we just solve for k with the lower and upper bound from (a)? or what?</p>
<p>I’m just aiming for a 3 since a 5 gives the same credit in my case :D.</p>
<p>hmm… calculator… :)</p>