Problem-Solving and Data AnalysisVery hardPoint above a line of best fit
Problem-Solving and Data Analysis practice question
A scatterplot has the line of best fit y = −2x + 50. One point on the scatterplot has x-coordinate 10 and lies 6 units above the line of best fit. What is the y-coordinate of that point?
Answer: 36
The line gives y = −20 + 50 = 30 at x = 10; 6 units above is 36.
Common wrong answers
- If you answered 24
- 24 puts the point 6 units below the line.
- If you answered 30
- 30 is the y-value on the line.
- If you answered 56
- 56 adds 6 to the y-intercept.
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