<p>Hitstogram III has the most variance</p>
<p>Histogram II has the least</p>
<p>or it's the other way around, i can't remember the order of the questions</p>
<p>It was not really probability for the most part.
M=D+E
M (and D + E) less < 0, given that average E is 0 with standard deviation 1.5. You are given that D (actual depth) = 2. This means that 2 + E < 0, or E < -2. This equates to a z-score of -1.33 and you look up the chart and its the .0918 or w.e it was.</p>
<p>i'm guessin (hoping?) this year is the year they restandardize the tests...which would explan why this year's test was so much more difficult than the previous years' tests.</p>
<p>OMG! I'm getting these right! HOLY CRAP, 9.18% was my answer hahahaha, and I got the same for those variance ones, lol</p>
<p>man what happens if i got a z-score of 1.33 and said my probability was 90.218 isntead of 9.18 would i still get partial credit or would they be *****es and dock me?</p>
<p>Actually, it was very easy test other than #6. I spent almost 45 mins to solve #6, so I almost couldn't solve the #5(I solved #6 first and then went back to #1).</p>
<p>Hitstogram III has the most variance</p>
<p>Histogram II has the least</p>
<p>or it's the other way around, i can't remember the order of the questions</p>
<p>i thought it was Histogram III and I</p>
<p>i dont understant double negatives theripcurl1969</p>
<p>for #6, the first guy was right, histogram III had the most variance (more range, higher IQR, more SD, less compacted than histogram I), and histogram II had the least variance</p>
<p>btw, for #6c, is it possible to still get full credit if i did extraneous conditions (i panicked and added that a.) it was a random sample b.) expected counts >=5 (-_-) c.) sample <10% of population)</p>
<p>for #5 i'd be happy to get anything higher than a 1, i didn't know how to explain the statistically significant stuff :</p>
<p>you guys shouldn't be that worried because our teacher is on CollegeBoard and we're probably one of the most prepared kids and most of us STILL did bad </p>
<p>4 people or so out of 55-ish that took it were sure they had a 5, everyone else, even the people with 95%+ in the class bombed it and said they were sure they only got a 3 or 4 on it and a lot of us skipped some parts due to the time restriction</p>
<p>bleh, i just hope the curve for a 5 would be lowered to like a 50% :D</p>
<p>oh, and:</p>
<p>1.) was the p-value for #6c between 0.20 to 0.25?
2.) s^2 just means it's sample standard deviation squared right?
3.) for the graphs on part d and e, do we just mark the part where it would reject the null hypothesis?</p>
<p>timeless-
They use different tests overseas, which would explain why you didn't see the same problems we did. My teacher has given us practice ones from here in the U.S. and overseas. Honestly, the ones they give overseas seem much easier than the ones given in the U.S., but that's my opinion.</p>
<p>**** that test, i swear at least they should tell us the test would be funky this year my god i wasnt expecting that</p>
<p>Well, my teacher actually did cover chi-square before the exam and I'll say, it didn't help me at all and my statistics average is a 100 in that class so it's not like I didn't understand normal chi-square problems. After doing practice problems and stuff, I'd say we were given one of the toughest free responses on any ap stat exam.</p>
<p>man i got all of 6 right except when calculating the standard deviation on my calculator i put in 1-10 and then the corresponding numbers, but i accidentally did 1variable statistics L1, L2. it should have just been L2. i got for my standard deviation like 1.69 sumthan, but i just redid the correct one and its 1.4 Do u think collegeboard will take off a lot for such a ridiculous mistake. honestly i will kill sumone if i get a a 4 cause everything else was perfect. </p>
<p>correct me if im wrong the cutoff point was 1.64 right? so then that would make my conclusion about the hypothesis wrong also. omg</p>
<p>joe you are talking about #6?</p>
<p>yeah, number 6</p>
<p>i got the probability right for part I of number 3, and im 90% sure that number two was just binomialcdf(x,.9,x) right? but part III was like kinda confusing, was its binomialpdf(thats what i put anyways). Oh and did anyone put III for highest variance on number six because it had the greatest area to the right, meaning it was less sure at the 95% level(i also added that it had a larger range, but i was quite sure of my first answer because the question asked "using part e" and part e was based on us finding the 95% cutoff. im not quite sure if my reasoning is right though.</p>
<p>number 6's a)
the hypotheses, What did you guys put?</p>
<p>h0: there is no statistically significant difference between the actual and expected whatever the question was talking about</p>
<p>ha same without the no infront of statistically</p>
<p>for number 6 i failed to reject the null hypotheses, anybody else get that?</p>
<p>and also, for the confidence interval question, what did you guys get? for some reason, i did a 2 sample Z porportions interval even though it said 1 sample means (thats what i originally did but i changed it at the last minute for no apparent reason). it was 1 sample but it was comparing two different things. and i did a porportions instead of means because it gave you the numbers of people for each.</p>
<p>I accepted Ho for number 6 C)? or something...
p was like 0.22 or something like that.
For the Confidence Interval with the emergency room thing... I thought you were looking for the difference between the two means? I use 2-SampleTTest.</p>
<p>What is the definition of:
s
and SE of the slope
for that LSR question?</p>
<p>And what was that probability of the part c) for the siesmologist question?</p>