<p>1337Haxor, yeah your method was much smarter, and it probably resulted in a more accurate answer since it involves much less computation. I agree with you completely on #6 as well. Oh BTW, I didn't use any calc programs either for part b...</p>
<p>It seems to me that the only questions that we still don't have a consensus on is for # 2, where it asks to "interpret" s and the se of the slope, as well as for # 5, where it asks to list the treatments.</p>
<p>what did everyone put for question #1?</p>
<p>i have question on 6a, the hypotheses part</p>
<p>i was freaking out on 6b, so i panicked and apprarently lost my mind a little bit and didn't write solid hypotheses, which i would've normally done. do you guys think these are acceptable?</p>
<p>null: variance(subscript now) = variance(subscript past) = 1.52
alternate: variance(subscript now) > variance(subscript past) = 1.52</p>
<p>That's essentially what I did</p>
<p>s is the standard error about the line. It is about 2 and compared to the range of the heights, it is small therefore suggesting a very strong fit. The standard error of the slope is .7553. Since the slope is 9.5, this variability is small, also suggesting a strong fit.</p>
<p>chipset, I think you right.</p>
<p>Grading the ap stats free response questions out of only 4 points is retarded. Consider the following scenario: you set up the answer for a question perfectly, using the right formulas, correct steps and deductions, but if you do a silly calculator mistake or don't round correctly that might cost you a point. Well for AP calc a point off a single free response is not way too bad, it would only result in a deduction of 1/9th of the total possible points. In ap stats however, one single point results in a 25% deduction of the total possible points.</p>
<p>If you make an calculation error, you will still get the full marks if you showed the correct "stats work." It's stats concept they care about, not whether u can punch numbers into the calc.</p>
<p>chipset...they asked for interpretation of S in context...what would you conclude about soapsuds and detergent?</p>
<p>There is a strong linear relationship between soapsuds height and the amount of detergent.</p>
<p>bump 10 chars</p>
<p>I got the same for the #3 with the 1 - p^3</p>
<p>6) My hypothesis were Ho : S = 1.52, Ha : S > 1.52 (or something like that).</p>
<p>^ I swear, if that hypothesis is wrong, i'll kick myself, because that's what i put too</p>
<p>I put population variance <= 1.52, Ha pop variance (new) is greater than 1.42.
S is just standard deviation, you are using that to make inferences about the actual new population variance.</p>
<p>Hmm, by looking at this, I got a nice ass beating by numbers 2 and 5, great. I got 3 and 4 essentially correct which is always good, and I got at least part of number 6 right, yay.</p>
<p>For number 1b, the answer is Catapult B because the measurements are precise, correct?</p>
<p>Yes about number 1b.
I expect a 4 on numbers 1 and 4..
But everything else was awful, probably got 2 on each.</p>
<p>I also used catapult B. How did you answer the question about how far should the catapult be placed?</p>
<p>The measurements in the band must cover a 5 inch band, so I just found the measurement that had the most amount of distances within 2.5 inches on it, which I got to be about 137.5. The band would cover 135 - 140 inches, and by looking at the dotplot for catapult B, the greatest amount of distances fall within that range, therefore maximizing.</p>
<p>I put 138.5, because that covers 136-141. If you look on 135 inches it only has 1 dot, and 141 inches has 2 dots. So that would be the maximum.</p>
<p>Eh, I wasn't really thinking straight that day. Oh well, maybe my multiple choice was good enough to get me a 5 on the exam.</p>