2014 AP Statistics Thread

Test Preparation AP Test Preparation
101

<p>Answer was .0633 if you used binomialpdf. case closed. </p>

102

<p>@plurmorant‌ - Thanks, do you remember if that was C or E?</p>

103

<p>@catchinginfinity‌ Sqrt(Standard deviation of 1^2+ standard deviation of number 2^2). </p>

104

<p>oh wait i think im thinking about the wrogn question. ya i think @plurmorant‌ is right</p>

105

<p>hey is there anyway we can start a group live chat?</p>

106

<p>wait, so have we concluded that we should’ve said engine size?</p>

107

<p>Was engine size group III? Pretty sure the answer was group III.</p>

<p>For all the questions about adding or subtracting standard deviations, did you guys use the formula (sqrt variance/n + variance/n)?</p>

108

<p>Answer was group III because the other one had a pattern in the residuals</p>

109

<p>you dont divide by n when adding variances</p>

110

<p>the formula you used was the standard error of a 2 sample t test</p>

111

<p>@catchingin</p>

112

<p>It was graph III (wheel sizes) due to the pattern in the residuals in graph II. </p>

113

<p>It should have been wheel base. Since the graphs were residuals versus engine size/wheel base, essentially they were residual plots. You want your residual plot to lack any noticeable patterns and the versus engine size graph was much more “linear” than the wheel base one. Thus wheel base was the proper choice since the randomness in the residual plot indicated the lack of any underlying patterns in what would be the actual graph of FCR versus wheel base.</p>

114

<p>I disagree with that answer, and I’ll explain why in two days :slight_smile: (there’s a detail in the graphs that I think you all missed, but I’d rather follow the CollegeBoard’s policies). </p>

115

<p>@countingkg I think I caught that detail as well! I’m itching for it to be released haha</p>

116

<p>they like to throw in tricks, but not something that maybe 1 out of every 15 people who understood the significance of the scattered plot would recognize</p>

117

<p>@countingkg‌ could u pm me why its II and not III?</p>

118

<p>what do u guys mean in 2 days???</p>

119

<p>By two days I mean when the frq’s are released.</p>

<p>Essentially it has to do with what the axes were labelled, if I’m remembering correctly. That’s all I’ll say now. </p>

120

<p>Do you guys think if I got a 30/40

  1. 3
  2. 1
  3. 2
  4. 1
  5. 4
  6. 3</p>

<p>Would I get a 5?</p>