Paper 2 · Statistics
⏱ Tested in 2 exam questions since 2016
Lesson 18 of 21
Statistics 18 Central Limit Theorem, trends in population proportion
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
- State the Central Limit Theorem: 30+ sample means always form a normal curve
- Explain why population size doesn't matter for inference — only sample size n
- Show p(1−p) peaks at p = 0.5, making 1/√n the worst-case margin of error
- Explain why halving the margin of error needs four times the sample size
Most recent exam questions
- 2018 P2 Q8(b)(ii)
- 2016 P2 Q9(c)
💬 Stuck on something in this lesson?
Send your question with this lesson’s name attached — you’ll get a reply by email.