Smartphones and purchases. Refer to Exercise 8.1 (page 489). (a) Find SEp, the standard error of p. (b) Give the 95% confidence interval for p in the form of estimate plus or minus the margin of error. (c) Give the confidence interval as an interval of percents.

Sample Distributions (Chapter 10) Important definitions explained in these notes: Sample space Event Parameter Statistical inference The Law of Large Numbers Discrete Probability Models Continuous Probability Models Random Variable Random Variable X bar or xx Central Limit Theorem An unbiased estimator The Rules of Calculating Probabilities: All values between 0 and 1 If S is sample space of a probability model, then P(s)=1 Addition rule for disjoint events: if two events have no outcomes in common, the probability that one or the other occurs is the sum of their individual probabilities a. P(A or B) = P(A) +