<p>and i guessed 0.22 for the marble</p>
<p>The regression question (38 or 39 not sure ) on the MC was really hard. I took a complete blind guess.</p>
<p>^ what was 39 about?</p>
<p>for some reason, on the marble one, i dont think the correct answer was one of the choices because you find the chance of getting the same color for each color by multiply (i.e. 3/10 x 2/9) and then add it together, but that answer was not on there</p>
<p>The FRQ’s were better than the MC</p>
<p>The marble one was definitely 0.22. It was with replacement so basically it was .3^2+.2^2+.2^2+.2^2+.1^2</p>
<p>There was not a type on the histogram, the number on the bottom were not standard deviation/z - score it was pc-pm or something like that, so it could be negative</p>
<p>Lainie49, it said there was replacement, so you would simply do (3/10)^2.</p>
<p>ephemeralbliss, I sure hope so, I completely BS’d my answer on that question and I’m relying on sympathy points from the graders for the typo lol</p>
<p>Ok, so I thought about the egg one, and isn’t it supposed to be total variance of carton&12eggs= variance of carton + variance of egg +variance of egg + variance of egg + …etc… to be carton variance +12 x variance of egg</p>
<p>and thus standard deviation of egg is sqrt(total variance of carton&12eggs - variance of carton)/sqrt(12)</p>
<p>its not converting units so its NOT the standard deviation of an egg being multiplied by 12 …so you can’t just divide by 12</p>
<p>right?</p>
<p>It definitely was a typo, the scale went from -0.3 to -0.17 to -0.20 to 0.13</p>
<p>Hahah thanks papasmurf88, i guess right then! 
any one remember that one question about rolling 3 dice and taking the smallest number? and the answer choices were graphs? what was the answer? I chose the one with the probability decreasing</p>
<p>@castor2pollux
you just divide by 12 not the sq root or anything</p>
<p>The answer on the coin flip plus die was 6. Anybody get the psychology an foreign language probability one? Hardest one on the test? That last MC on the r value should have been with the mean x bar and y bar on the graph.</p>
<p>Am I the only one who added the variance? I though you always add variance even if you want to see the differences.</p>
<p>.13 i think, but i backsolved so im not sure</p>
<p>But you have to square the coefficient in front of the variance to get the new variance.</p>
<p>It was definitely a typo, you can’t just go from the x-axis -3.2,-1.7 and then to -.2, and back to .13. I circled it saying ***? and then wrote above I am going to do this problem assuming that -.2 is -.02.</p>
<p>I know but it then I thought about it and it doesnt make sense to do it. You did it when you convert from units because you’re directly multiplying the VALUES themselves by 12, however in this case you have a sample of 12 eggs and one carton, and each egg can be thought of as having its own standard deviation except that their values are equal.</p>
<p>did u guys say no relationship for the histogram one tho?</p>
<p>Oh. I got that one @TheBombingRange I just don’t remember the answers…
I’m pretty sure it was like .13 or something, choice D. </p>
<p>@Lanie49 I also did the decreasing as in the right-skewed. </p>
<p>@castor I divided it by 12^2 so by 144 since the original standard deviation = 12 (sigma)
if you change that to variation then you would square 12.</p>