2014 AP Statistics Thread

<p>Guys I’m pretty sure that question 5 on FR was a two sample t test. Matched pairs is for two samples of the same group that are dependent. The women and men avg dollars spent on a car had no effect on the each other.</p>

<p>@ColinVW‌ I get where you’re coming from but the samples in this case are not the group of men and women but rather the car models.</p>

<p>So if we ran a 2 sample t test flawlessly and it should be matched pairs what score would we go down to? Are you saying that the cars receive a treatment that is men buying and women buying?</p>

<p>The difference of how much the men and women paid is dependent on the car model. That’s how I see it, at least. I don’t think you would be marked down as long as everything is consistent. In one practice FRQ, there were multiple ways to carry out the hypothesis test, but the score guide did specify the “best” method.</p>

<p>Can someone explain FRQ 6 C and D?</p>

<p>Can someone please tell me where the dot is supposed to be circled on number 6? @hawkace also, for number 5, I didn’t mention any sort of tests or hypothesis. I said that women do pay more money per car in a particular county because of the evidence. could I still get 1 point?</p>

<p>Also, have we come to a consensus in regards to whether it was wheel base or engine size?</p>

<p>Also, have we come to a consensus in regards to whether it was wheel base or engine size?</p>

<p>@XCBro4Life‌ The dot is between 90 and 95 (inches) and right under 1.0 (residual FCR).</p>

<p>@XCBro4Life‌ the circle should be circled at (0.95, 93) on Graph III. The value 0.95 is the residual from reg of FCR on length which u calculated in part (a) , and the 93 is given in the table just above that part (b) (i) of that question </p>

<p>@mzr1998 thanks. what did you get for 6a? please reply</p>

<p>@sahil9797 what did you get for 6a?</p>

<p>@XCBro4Life‌ for 6a, </p>

<p>FCR hat = -1.595789 + 0.0372614 * 175 = 4.924956</p>

<p>Residual = Actual - Predicted = 5.88 - 4.924956 = 0.955044</p>

<p>j</p>

<p>wait, I just put 4.924. Would I get points for that or no?</p>

<p>Residual = Actual - Predicted
Residual = 5.88 - Predicted</p>

<p>Predicted = -1.5958 + 0.03726 (175)
Predicted = 4.9247</p>

<p>Residual = 5.88 - 4.9247
Residual = 0.9553</p>

<p>@sahil9797 @hawkace also, for the question that was like is there reason to doubt (about the 3 women.) I said no because theoretically it is possible. COuld I get points for that?</p>

<p>Interpretation: The actual FCR value is 0.955044 FCR higher than the predicted FCR value calculated from linear regression line</p>

<p>@XCBro4Life‌ even I said NO for the reason to doubt question </p>

<p>I said 95% of the variation between the two variables is accounted for by the lsrl</p>

<p>@XCBro4Life‌ Lol I didn’t even do the problem without replacement. I did (1/3)(1/3)(1/3). It was suppose to be (1/3)(1/4)(1/7) right?</p>