IB skill practice

Interpret confidence interval decisions

Use a confidence interval to decide whether a hypothesised value is plausible.

Paper 1, Paper 2 5 marks Difficulty 4

Interpret confidence interval decisions - diagnostic reading

A finance desk confidence interval is \([18,25]\). A proposed value is \(19\). Enter 1 if the proposed value is inside the interval, otherwise enter 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.