SAT

Maths · Problem-Solving & Data Analysis

Unit 3 of the SAT Maths build

Make SAT data and proportion problems routine

Seven core topics covering ratios and proportions, percentages, summary statistics, variability, two-way tables and probability, scatter plots and best-fit lines, and sampling and inference. Each topic has a concept refresher, two worked examples, and an eight-question test.

Core topics

Topic 1

Ratios, rates & proportions

Direct vs inverse · cross-multiplication · unit conversion

Topic 2

Percentages

Percent of · percent change · increase / decrease · originals

Topic 3

Mean, median, mode, range

Centre · spread · outlier sensitivity · skew

Topic 4

Standard deviation & variability

Spread · effects of shifting and scaling · comparing histograms

Topic 5

Two-way tables & probability

Joint · marginal · conditional · independence

Topic 6

Scatter plots & best-fit lines

Direction · residuals · prediction · correlation

Topic 7

Sampling, surveys & inference

Random samples · bias · margin of error · causation

How to work through this. Read the concept, walk through both worked examples, then hit Take a test to lock in the idea with 8 MCQs. When you've worked through several topics, head back to the parent SAT Maths page to take a cross-topic test or revise with flashcards.