Problem-Solving and Data AnalysisHardResidual of a data point
Problem-Solving and Data Analysis practice question
For a set of data, the line of best fit is y = 0.8x + 12. One of the data points is (20, 31). What is the residual for this point, defined as the actual y-value minus the predicted y-value?
Answer: 3
Predicted y = 0.8(20) + 12 = 28; residual = 31 − 28 = 3.
Common wrong answers
- If you answered 28
- 28 is the predicted value.
- If you answered 31
- 31 is the actual value.
- If you answered -3
- −3 subtracts in the wrong order.
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