Pearson Edexcel IAL S2 Statistics 2 Notes
Free Pearson Edexcel IAL S2 Statistics 2 notes on distributions, sampling and hypothesis tests, including prerequisites and the S1 + S2 route.
S2 Statistics 2 is an IA2 applied unit in Pearson Edexcel International A Level Mathematics. It extends S1 Statistics 1 into Poisson and continuous distributions, sampling and hypothesis tests. For the full Mathematics award, S2 is used in the S1 + S2 applied pair alongside compulsory P1 to P4.
Use this page as an independent revision note for the current Issue 3 specification. It is not Pearson's solution bank or a reproduced mark scheme. Your centre should confirm the units it will enter and cash in.
Official unit scope
- Binomial and Poisson distributions.
- Continuous random variables and probability density functions.
- Continuous uniform distributions.
- Normal approximations and continuity corrections.
- Sampling, hypotheses and significance tests.
Where S2 fits
- Level: IA2 applied unit.
- Full IAL Mathematics route: S1 + S2.
- Official prerequisites: S1 plus differentiation and integration of polynomials, binomial coefficients and the exponential function.
- Revise first: probability notation, discrete distributions, expectation and variance from S1.
The specification assumes prerequisite knowledge stated for the unit, so later-unit questions may combine earlier methods without re-teaching them. Treat the list above as an integrated toolkit. A question can begin in one topic and finish in another, such as using algebra to form a model, calculus to optimise it and a graph to interpret the result.
Core reasoning and methods
- Check the event rate and interval assumptions before choosing a Poisson model.
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