IB skill practice

Interpret confidence intervals for proportions

Connect a proportion confidence interval to a contextual claim.

Paper 1, Paper 2 5 marks Difficulty 5

Interpret confidence intervals for proportions - exam scenario

Confirm the modelling meaning first. A coastal council estimates a proportion with confidence interval [0.44, 0.56]. State 1 if claim \(p=0.50\) is plausible from the interval, otherwise state 0. 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.