Descriptive Stats Skills Tests

Descriptive Stats — Beginner

Foundations of descriptive statistics: measures of center and spread, tables and charts, variable types, and reading summaries without inferential claims. Mix of single-answer and multiple-answer items; multi-select questions ask you to select every correct statement.

Descriptive Stats — Intermediate

Intermediate descriptive statistics: variance and standard deviation, IQR and box plots, weighted means, z-scores, correlation as association, and choosing summaries under skew or outliers. Mix of single-answer and multiple-answer items; multi-select questions ask you to select every correct statement.

Descriptive Stats — Advanced

Advanced descriptive statistics: Simpson’s paradox in aggregates, robust and transformed summaries, quantiles and winsorization, bivariate association limits, multimodal distributions, and reporting choices. Mix of single-answer and multiple-answer items; multi-select questions ask you to select every correct statement.