IB skill practice

Use chi-square tests for independence

Calculate expected counts, chi-square contributions, degrees of freedom, and contextual conclusions.

Paper 1, Paper 2 5 marks Difficulty 3

Use chi-square tests for independence - exam scenario

Case V2. In this AI HL exam-style task, compare observed and expected frequencies and identify the requested test statistic component. Enter the requested numerical value and choose the interpretation that matches the context.

Worked practice: result and interpretation

Calculate the requested result first, then choose the interpretation that follows from it.