Problem-Solving and Data AnalysisHardResidual from a line of best fit
Problem-Solving and Data Analysis practice question
The line of best fit for a data set is y = 2x + 10. One data point is (15, 42). What is the residual for this point, the actual y-value minus the predicted one?
Answer: 2
Predicted y = 2(15) + 10 = 40; residual = 42 − 40 = 2.
Common wrong answers
- If you answered 40
- 40 is the predicted value.
- If you answered 42
- 42 is the actual value.
- If you answered -2
- −2 subtracts the wrong way.
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