12–15% of the AP exam. Key topics: One-sample z-interval for a population proportion p, One-sample z-test for a population proportion p, Two-sample z-interval for a difference in proportions p₁ − p₂, Two-sample z-test for a difference in proportions p₁ − p₂, Conditions for inference: Random, 10%, Large Counts (np̂ ≥ 10 and n(1−p̂) ≥ 10), Four-step inference procedure: State, Plan, Do, Conclude, Interpreting confidence levels and confidence intervals in context, Interpreting p-values in context, Type I error (false positive) and Type II error (false negative), Power of a test: definition and factors that affect it, Factors affecting width of confidence intervals.
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