Common Core: S-ID.6b
Problem 12 of 45s12-012
For a class, the least-squares line is predicted score (hours studied). One student studied 6 hours and scored 63. What is her residual, and is her point above or below the line?
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Solution walkthrough1:32
- A residual is observed minus predicted: how far the real point sits above or below the line.
- Put hours into the line: predicted score .
- Residual observed predicted .
- The residual is negative, so the real score is less than predicted: the point is below the line.
- Traps: is predicted minus observed. skips the slope. A negative residual is below the line.