Paper 2 · Statistics
⏱ Tested in 5+ recent exam questions
Lesson 17 of 21
Statistics 17 – Confidence Intervals
This tutorial is for members
Read the lesson notes free below — subscribe to watch the full worked video and download the PDF.
Subscribe for full access · €199/yrYou’ll learn
- Construct a 95% confidence interval for a mean: x̄ ± 1.96·(σ/√n)
- Construct a 95% CI for a proportion: p̂ ± 1.96·√(p̂(1−p̂)/n)
- Pick mean CI vs proportion CI from the question's noun (average vs percentage)
- Interpret the interval: '95% confident the true value lies between…', with units
Most recent exam questions
- 2025 P2 Q10(b)
- 2024 P2 Q7(c)(i) — deferred
- 2024 P2 Q7(c)(ii) — deferred
- 2023 P2 Q8(b)(i)
- 2023 P2 Q8(c)
💬 Stuck on something in this lesson?
Send your question with this lesson’s name attached — you’ll get a reply by email.