<p>I wasnt sure about number 2. I thought that another 500 samples wouldnt eliminate problems/bias due to part A, like people choosing not to respond, not including families without elementary children, people not being able to write, etc.</p>
<p>^ exactly. once bias is present, surveying more people is only propagating the problem.</p>
<p>also, since the question talked specifically about nonresponse bias, i mentioned that families on vacation (who would be less likely to approve of year-round schooling) wouldn't be able to respond... haha it was the best i could do.</p>
<p>the equation that catalysis mentioned in post #153 was the equation I used for the standard error in 4c, I think it made sense. And he/she is right about 5 being GOF</p>
<p>so did anyone get part 2c? another way to do it? i didnt ahve time so i just put people could go to individual houses and survey them so there is no nonresponse bias.</p>
<p>Yep Catalysis, got 0.325 here</p>
<p>Did you guys have a response for the last part in number 6? I said something along the lines that it provides a clearer picture of the true relationship between the pretest vs. posttest scores for the individual schools instead of just comparing the true mean differences between the schools.</p>
<p>man, that stupid moose question sucked.
i definitely got a 0 then; because the word "proportion" completely tricked me into believing that it was a linear regression t test!!</p>
<p>i did same thing stanford</p>
<p>@fivewinks
@JtotheEW</p>
<p>me too :-(</p>
<p>that could very well mean goodbye 5 for me :-(</p>
<p>:-( ;-( ;-( </p>
<p>in barron's test i was always either barely above the 5 cut off or one point below it :-( i didn't even get to read question 4 :-(</p>
<p>Except for the very last page - couldn't finish the very last part (ran out of time!!! I swear I repeat unnecessary things too much - especially when describing distributions.) - the test really disappointed me. I expect challenges from AP exams, and AP Statistics is the only one that has failed to live up to that expectation.</p>
<p>Yeah, nothing was really challenging on the Stats exam. I was happy =]</p>
<p>febreeze..my answer was almost exactly like that!</p>
<p>i messed up on # 4 even though it was one of the easiest ones...i didn't graph temperature vs. percentage/proportion of working devices...i just made a scatterplot of temp vs. # of devices working. i definitely got a 0 on that. good bye to my 5! :(</p>
<p>MC were okay, but I had to skip like 4.<br>
FRQ: 1st was easy, 2nd one wasn't, 3rd and 4th were easy, 5th was okay except for the last part.<br>
I was on the 5th problem when our proctor announced we had 25 minutes left, so I had to rush through the investigative task. I finished it, but I wrote absolutely minimum work and explanations, so I don't really know how that will work out.<br>
I really hope I got 5!</p>
<p>@fivewinks
@JtotheEW
@Carlosd3co</p>
<p>That's what I did. Although I stated Chi-Squared GOF, I did Linear Regression b/c I couldn't figure out the expected values (forgot to do it by hand, although I did get question 2 right where they asked about the expected values).</p>
<p>I asked my teacher what I could get, he said I might get 1 point because I stated the right test.....:(</p>
<p>I was plesantly surprised with this test. The wek before my AP Stats teacher gave us a practice test (which by the way was 40% of our overall grade) and I did soooooo bad on it. I was just praying that this test would be easier and lo and behold it was!MC was pretty easy...I think I skipped five that I really wasn't sure of and oonly guessed on 2 or 3. FR was super easy... one was fine 2 was a little tricky in my opinion- experimental design has never been my area of expertise. I don't really remember 3...was that the probability one with the arcade? I don't remember 4 or five either...hopefully that's a good thing and not bad! 6 seemed way too easy to be a 6 question but hey...I'm not complaining!</p>
<p>for 4c what does associated standard error mean? i just made up some numbers and wrote down whatever.</p>
<p>on the FRQ..is the lowest u can get a 0 or a 1? i thought the scale was from 1-4</p>
<p>i put the square root of SSResid/(n-2) for standard error, but i'm not sure if that's right. i love how i still don't know anything about stats even after i took the ap test.
& i'm pretty sure you can get a 0 if you skip the question completely, but if you made an effort you can probably easily get a 1.</p>
<p>@radyland: I honestly have no idea what that means...at least your not the only one!
@iveleague104: You can definetly get a 0 but you ususally only get one if you don't write anything at all or if you just completely guessed on it (and guessed very very very wrong at that)</p>