IB skill practice

Calculate pooled proportions

Pool two sample proportions for a two-proportion z test.

Paper 1, Paper 2 5 marks Difficulty 5

Calculate pooled proportions - exam scenario

Confirm the modelling meaning first. For a delivery depot two-proportion test, sample counts are 38 out of 108 and 25 out of 103. Calculate the pooled proportion. Enter the requested value and choose the interpretation that matches the result.

Worked practice: result and interpretation

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