This page is set up for AP Statistics Collecting Data. Generate a question, answer it, and read the explanation before moving on.
Principles of study design, sampling methods, and sources of bias to support valid inference. Expect questions involving Sampling designs: simple random, stratified, cluster, multistage; Experiments vs observational studies, randomization, control, blocking; Bias, confounding, and ethical considerations.
Try explaining this unit's core idea to someone else in under 60 seconds. If the explanation drifts, you found a gap worth fixing before test day.
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