<p>Dividing by zero results in unde-r-fined 
</p>
<p>You cant use undefined variables in chi square.</p>
<p>^ I know duh lolā¦My calc showed me ā0ā when I divided by zero! ***.</p>
<p>āI know duh lolā¦ā</p>
<p>Says the one who made the mistake.</p>
<p>I had a feeling youād say that. Trust me, I know what happens when you divide by zero. Youāre just not the same person under time pressure.</p>
<p>Yeah i made the dividing by 0 mistake tooā¦
Anyways, the mcqs were pretty easy. The frqs were okay soā¦Iām hoping for a 5.
Since this is a new test do you guys think the curve will be more lenient? iām guessing 65%-70% but since everyone I talked to seemed pretty confident I canāt be sure.</p>
<p>Trust me not everyone was confident. Iām sure that about 3/4 of the people taking the test on my school had no idea what they were doing. Donāt let your perspective on the way people viewed the test be changed because of CC.</p>
<p>As I talked to people during the break, most said that they had no idea or guessed. I didnāt reply because I actually felt confident about my answers. Did anyone else run out of time? I barely finished but stillā¦</p>
<p>Yeah, I only did 3/6 Grid-In in like the last 3 minutes.
1.5 hours is not enough time for Section I.
They should give us 1.5 hours to do MCQās and 30 mins to do Grid-Ins, so Section I will take 2 hours. I can deal.</p>
<p>im worried because for the chi-squared test i just happened to make my null hypothesis exactly what the expected values were and ended up with a 0 as my totalā¦which obviously lets me accept the null but i have no idea how theyāre gonna take that
what do you guys think?</p>
<p>How did you guys get Expected Values to be equal to 0? The formula for expected value is RowTotal*ColumnTotal/Total and I donāt see how one can get 0 for any of the variables.</p>
<p>@Nidget At the end of the 10 minutes, I hypothesized that the flies would have chosen one chamber or the other, and none would be observed in the middle (the choice chamber). Thatās how you would have a 0.</p>
<p>@nidget i happened to guess/choose percentages that matched the observed values. 75% 5% and 20%. it was literally my guess of how many flies would be in each area of the chamber and it ended up being exactly the same as the values that were given as observed. so (o-e)^2/e since i got zero for (o-e) everything ends up as zeroā¦</p>
<p>im just wondering if that still countsā¦i said why i accepted my null and everything</p>
<p>sigh, got part C completely wrong (simply math mistake ugh). Even if my calculations were completely off, but i still justified it correctly in part D, would i get the points for part D? also, does anyone remember what part E was?</p>
<p>What score do you guys think, sayā¦45/69 on the mc and maybe 70% on the free response will amount to?</p>
<p>@crystal19 This is just speculation but Iām guessing that would be a high 4 or low 5.</p>
<p>The expected was 21-18-21. Using 58-1-1 would conflict with your null hypothesis and is definitely not expected.</p>
<p>Was there really a formula for expected? I guessedā¦ ugh stupid</p>
<p>Out of the 32 kids in my AP bio class, only 2 said it was easy. Those were the two smartest people in our class too</p>
<p>@APFirsttimer - I didnāt know there was a formula for expected either. Our teacher only showed us how to do chi squares when expected values were given. Hopefully we can still get partial credit for doing the math part correctly though.</p>
<p>Just took the exam.</p>
<p>In my opinion, the multiple choice was harder than the free response questions. The FRQs were rather vague in its wording in my opinion so for the short ones, since you are supposed to only spend 6 minutes on them, I think that those questions were not meant to be extremely difficult</p>
<p>Multiple choice was not bad but I was unable to finish 3 grid-ins even though the grids-ins were conceptually much easier than other MCs and I even got to the answer to question 4 but did not have time to bubble because I had trouble handling the four function calculator</p>
<p>Also did anyone else see a resemblance between the AP and the Olympiad semifinal Part B exams with the scenario and data analyses? Not to say of course, the two are on the same difficulty level since the Olympiad is much much harder, but there is a similarity in question format imo</p>