AP统计学 2015年真题 附答案和评分标准 AP Statistics 2015 Real Exam with Answers and Scoring Guidelines.pdfVIP

AP® Statistics 2015 Free-Response Questions © 2015 The College Board. College Board, Advanced Placement Program, AP, AP Central, and the acorn logo are registered trademarks of the College Board. Visit the College Board on the Web: . AP Central is the official online home for the AP Program: . ® 2015 AP STATISTICS FREE-RESPONSE QUESTIONS Formulas begin on page 3. Questions begin on page 6. Tables begin on page 14. -2- ® 2015 AP STATISTICS FREE-RESPONSE QUESTIONS Formulas (I) Descriptive Statistics xi x n 1 2 sx n 1xi x n 1 s2 n 1 s2 1 1 2 2 s p n 1 n 1 1 2 ˆ y b b x 0 1 xi x yi y b 1 2 xi x b y b x 0 1 1 xi x yi y r n 1 sx sy s b r y 1 s x ˆ 2 yi yi n 2 s b1 2 xi x -3- ® 2015 AP STATISTICS FREE-RESPONSE QUESTIONS (II) Probability P(A B) P(A) P(B) P(A B) P(A B) P A B ( ) P B ( ) E (X ) µx x p i i 2 Var(X ) s 2 x µ p x i x i If X has a binomial distribution with parameters n and p , then: n k nk P(X k ) p (1 p) k µx np s np(1 p) x µˆ p p p (1 p ) s 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