10–18% of the AP exam. Key topics: One-sample t-interval for a population mean μ, One-sample t-test for a population mean μ, Paired t-procedures: t-interval and t-test for paired differences μ_d, Two-sample t-interval for a difference in means μ₁ − μ₂, Two-sample t-test for a difference in means μ₁ − μ₂, Conditions for inference on means: Random, 10%, Normality/CLT, Assessing normality condition from data (small n: inspect plot; large n: CLT applies), Degrees of freedom for t-procedures, Using t-table and calculator for t-probabilities and critical values, Interpreting results of t-procedures in context.
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