Problem-Solving and Data AnalysisVery hardPoint with a positive residual
Problem-Solving and Data Analysis practice question
A line of best fit has slope 0.9 and passes through the point (10, 15). Which of the following data points has a positive residual with respect to this line?
- A. (20, 26)Correct
- B. (20, 22)
- C. (0, 6)
- D. (10, 15)
Answer: A. (20, 26)
The line predicts 24 at x = 20; the point (20, 26) lies 2 above it.
Why the other answers are wrong
- B. (20, 22)
- (20, 22) lies 2 below the line.
- C. (0, 6)
- (0, 6) lies exactly on the line.
- D. (10, 15)
- (10, 15) lies exactly on the line.
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