Practice question · Numerical answer
A regression line has equation y = 3x + 5. Predict the value of y when x = 4.
Hints
- Substitute the value of x into the equation of the line.
- 3 times 4, then add 5.
Show the answer
17 (answers within ±0.01 count)
Why
3(4) + 5 = 17. The slope 3 means that on average y rises by 3 for each unit increase in x, an average change, not a promise about any individual data point.
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