AP Statistics Questions & Answers

AP Statistics Questions & Answers 5 step process: z/t test - ANSWER: State --> Ho/Ha, define parameter Plan --> one sample, z test Check --> random/normal/independent Do --> find p hat, find test statistic (z), use test statistic to find p-value Conclude --> p value ≤ α reject Ho p value ≥ α fail to reject Ho a point estimator is a statistic that... - ANSWER: provides an estimate of a population parameter. addition rule for mutually exclusive events P (A U B) - ANSWER: P(A)+P(B) bias - ANSWER: The design of a statistical study shows ______ if it systematically favors certain outcomes. Binomial Calculator Function for P(X≤k) - ANSWER: binomcdf(n,p,k) Binomial Calculator Function for P(X≥k) - ANSWER: 1-binomcdf(n,p,k-1) Binomial Calculator Function to find P(X=k) - ANSWER: binompdf(n,p,k) Binomial Formula for P(X=k) - ANSWER: (n choose k) p^k (1-p)^(n-k) block - ANSWER: A group of experimental units that are known before the experiment to be similar in some way that is expected to affect the response to the treatments. C% confidence intervals of sample proportions, 5 step process - ANSWER: State: Construct a C% confidence interval to estimate... Plan: one sample z-interval for proportions Check: Random, Normal, Independent Do: Find the standard error and z*, then p hat +/- z* Conclude: We are C% confident that the interval (_,_) will capture the true parameter (in context). calculate var(x) by hand - ANSWER: (X1-μx)²p(1)+(X2-μx)²p(2)+.... (Sigma(Xk-μx)²p(k)) calculate μx by hand - ANSWER: X1P1+X2P2+.... XKPK (SigmaXKPK) Categorical variables vs. Quantitative Variables - ANSWER: Categorical: individuals can be assigned to one of several groups or categories Quantitative: takes numberical values..