Discussion
One use of a regression line is :
Answer: D
One use of a regression line is to estimate the change in y for a one-unit change in x.
In the fitted line \(\hat{y} = a + bx\), the slope b is the estimated average change in y for each one-unit increase in x, and the line is used to predict y from x.
A regression line does not by itself establish cause and effect, since association is not causation. Outliers are detected by examining residuals and data plots, not by the line alone.
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