AP Statistics notes on SAMPLING METHODS : simple random sample, stratified sample, systematic sample, cluster sample, convenience sample... TYPES OF BIAS : undercoverage, nonresponse bias, response bias... and OBSERVATIONAL STUDIES & EXPERIMENT DESIGN : variables, treatments, control group, placebo, blocking, blinding, matched pairs, and more! Great for AP Stats Exam review! Aligns with AP College Board's updated 2019-2020 objectives and standards for AP Statistics Unit 3: Collecting Data. W