Problem-Solving and Data AnalysisHardDifference in predictions from a line of best fit
Problem-Solving and Data Analysis practice question
For a set of data, the line of best fit is y = 4x + 7. By how much does the predicted y-value at x = 8 exceed the predicted y-value at x = 3?
Answer: 20
The slope is 4, and x changes by 5, so the prediction changes by 20; check: 39 − 19 = 20.
Common wrong answers
- If you answered 4
- 4 is the slope.
- If you answered 5
- 5 is the change in x.
- If you answered 39
- 39 is the prediction at x = 8 alone.
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