Confidence Intervals
Confidence intervals for the mean of a normal population — computing intervals from summary statistics or raw data, the margin of error, interpreting intervals, and the effect of confidence level and sample size (syllabus 4.16).
Start practising → Formula sheet (PDF) ↗Sample questions
- Medium Confidence interval for a mean Calculator [4]
- Easy Interpret a confidence interval No Calculator [2]
- Medium Is a value plausible? No Calculator [3]
About this topic
These are original, exam-style questions written to match the IB Mathematics syllabus for Applications & Interpretation HL (Topic 4.16). Every question has a full worked solution with mark allocations matching real IB marking schemes, plus graphics-calculator steps for the t-interval routine.
How to practise
- Open the question bank using the button above.
- Attempt the question, writing out your working.
- Reveal the full worked solution and compare your method step by step.
- Use the difficulty and calculator filters to focus on what you need most.