Sampling, outliers and misleading displays

Develop critical data literacy by examining sampling plans, outliers, survey wording, and misleading displays. This precalculus extension practice set includes actual charts whose scales must be inspected, along with short scenarios about who is included in a sample and who responds. Single-select and multiselect questions require evidence-based judgments rather than slogans. Detailed explanations show how extreme observations affect summaries and why observational associations alone do not establish cause. The set stays within descriptive reasoning and study criticism, without confidence intervals or hypothesis tests.