Confidence Intervals for the Difference of Two Proportions

This guide covers two-sample z-intervals for comparing proportions between two independent populations. It explains the purpose, use case, and steps to construct the interval, including calculating sample proportions, standard error, and finding the critical value. The guide emphasizes checking conditions (randomness, independence, and normality) before calculations and provides the formula and a calculator shortcut. It includes an example comparing shooting percentages and focuses on exam preparation by highlighting key concepts, common mistakes, and interpretation of results. Finally, it offers practice multiple-choice and free-response questions with a scoring guide.