Problem Solving & Data AnalysisMedium
Two-variable data: Models and scatterplots
Interpret scatterplots, identify correlation, and use lines of best fit to make predictions.
Sample SAT Problem
A line of best fit is y = 2.5x + 10. Predict y when x = 8.
Show SolutionHide Solution
Step-by-Step Solution
y = 2.5(8) + 10 = 20 + 10 = 30.
Key Tips from Pamela
- Positive slope = positive correlation; negative slope = negative correlation.
- The line of best fit minimizes the total distance from all data points.
- Only predict within or near the data range — extrapolation can be unreliable.
Still stuck on two-variable data: models and scatterplots?
Send me your exact problem. I'll write out the solution by hand and email it to you — completely free.
Send Me Your Problem