Table of Contents Barron's Essential 5 Introduction Diagnostic Examination Answer Key Answers Explained AP Score for the Diagnostic Exam Study Guide for the Diagnostic Test Multiple-Choice Questions Theme One: Exploratory Analysis Graphical Displays Summarizing Distributions Comparing Distributions Exploring Bivariate Data Exploring Categorical Data: Frequency Tables Theme Two: Planning a Study Overview of Methods of Data Collection Planning and Conducting Surveys Planning and Conducting Experiments Theme Three: Probability Probability as Relative Frequency Combining Independent Random Variables The Normal Distribution Sampling Distributions Theme Four: Statistical Inference Confidence Intervals Tests of Significance--Proportions and Means Tests of Significance--Chi-square and Slope of Least Squares Line Practice Examinations Appendix Checking Assumptions for Inference 35 AP Exam Hints AP Scoring Guide Basic Uses of the TI-83/TI-84 Formulas Graphical Displays Table A: Standard Normal Probabilities Table B: t -distribution Critical Values Table C: x 2 Critical Values Table D: Random Number Table Index.