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AP Central is the official online home for the AP Program: apcentral.collegeboard.com. 2008 AP® STATISTICS FREERESPONSE QUESTIONS (Form B) Formulas begin on page 3.
Questions begin on page 6.
Tables begin on page 13. 2 2008 AP® STATISTICS FREERESPONSE QUESTIONS (Form B) Formulas (I) Descriptive Statistics xi
n x 1 sx xi x yi
xi y b1 r x xi 1 2 1 x
sx yi y
sy sy
sx yi
sb y b1 x 1
n n2 1 b1 x b1 r 2 n2 1 s 2
2 n1 1 b0 b0 x n1 1 s2
1 sp ˆ
y xi 1 n ˆ
yi n 2 xi x 2 2 3 2008 AP® STATISTICS FREERESPONSE QUESTIONS (Form B)
(II) Probability P( A B) P ( A) P( A B) P ( A B)
P ( B) P ( A B) μx E( X ) P ( B) xi pi s2
x Var( X ) xi μx 2 pi If X has a binomial distribution with parameters n and p , then: P( X μx sx μp
ˆ nk
p (1
k k) p )n k np np(1 p) p p(1 sp
ˆ p)
n If x is the mean of a random sample of size n from an infinite
population with mean μ and standard deviation s , then: μx sx μ
s
n 4 2008 AP® STATISTICS FREERESPONSE QUESTIONS (Form B)
(III) Inferential Statistics Standardized test statistic: statistic parameter
standard deviation of statistic Confidence interval: statistic critical value standard deviation of statistic
SingleSample
Standard Deviation
of...
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 Fall '11
 Mr.Zhang
 Normal Distribution, AP® STATISTICS FREERESPONSE, The College Board, STATISTICS FREERESPONSE QUESTIONS

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