Problem-Solving and Data AnalysisEasyMeaning of the y-intercept of a line of best fit
Problem-Solving and Data Analysis practice question
A line of best fit for a scatterplot is y = 0.5x + 20. What does the number 20 represent?
- A. The predicted value of y when x is 0Correct
- B. The increase in y for each unit increase in x
- C. The largest value of x in the data
- D. The number of points in the scatterplot
Answer: A. The predicted value of y when x is 0
The constant term is the value of y at x = 0.
Why the other answers are wrong
- B. The increase in y for each unit increase in x
- That is the slope, 0.5.
- C. The largest value of x in the data
- The intercept says nothing about the data's range.
- D. The number of points in the scatterplot
- The intercept is not a count.
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