Statistical Inference on the Digital SAT: the Desmos Method
A survey looks at a few people and then makes a claim about everybody. Every question in this skill is one of two moves: multiply a small group up to a big one, or step a margin of error either side of an estimate. Both are one line of arithmetic, and Desmos does the arithmetic.
Problem Solving & Data Analysis·65 practice problems in DesPrep
The Statistical Inference lesson is part of DesPrep
It is one of the 17 full lessons inside the subscription — 6 sections that take statistical inference from first principles to the fastest Desmos route, with a worked example on every one:
- Four numbers, and you are always given two of them
- Desmos is a calculator here, and it has one trap
- From the interval back to the estimate
- Scaling a sample up to a population
- Two samples of different sizes never compare directly
- What actually makes a margin of error smaller
Then 65 practice problems on this skill alone, solved inside a live Desmos calculator with step feedback and an expert replay on every one.
More Problem Solving & Data Analysis guides
- Scatterplots and ModelsGraph a line of best fit and read predictions straight off it, instead of substituting by hand.
- Ratios, Rates, Proportions and UnitsTurn a rate into a line and read any proportional value off it in seconds.
- PercentagesPercent change and growth, set up so Desmos does the arithmetic and the graph shows the trend.
- Distributions, Center and SpreadMeans, medians and ranges computed in the Desmos list bar rather than on paper.