Scatterplots and Models on the Digital SAT: the Desmos Method
A model is just a line or a curve someone drew through a cloud of data. Every question about it is a question about one point on that graph, so graph the model, pin the number you were given, and read off the number you were asked for.
Problem Solving & Data Analysis·65 practice problems in DesPrep
The Scatterplots and Models lesson is part of DesPrep
It is one of the 17 full lessons inside the subscription — 6 sections that take scatterplots and models from first principles to the fastest Desmos route, with a worked example on every one:
- A model is a graph, and a prediction is a point on it
- Given the x, pin it with a vertical line
- Given the value, read the year instead
- The line is the prediction, not the data
- Two models, one difference line
- When the model curves
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
- 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.
- ProbabilityTurn counts into a probability, reduced correctly every time, and keep track of which total the question restricts you to.