Joint, Marginal & Conditional Relative Frequencies

Learn to choose the correct denominator in two-way tables. Original survey, workplace and service scenarios develop joint, marginal and conditional relative frequencies, weighted summaries, 100% stacked bars and mosaic areas. Diagnose reversed conditioning, overlapping categories, empty groups and rounding. Prerequisites: fractions, percentages and basic categorical data. Includes single-select and multiselect practice with worked explanations and misconception-specific feedback.

Further reading and method references:

• OpenStax: contingency tables