Answer
$(A)$
Work Step by Step
The average rate of change of $f$ over the interval $[a, b]$ is given by:
Average rate of change of $f\displaystyle \ \ =\frac{f(b)-f(a)}{b-a}$
The units of the average rate of change of $f$ are units of $f(x)$ per unit of $x$.
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Over $[2,6]$, the average rate of change for $f$ was
$\displaystyle \approx\frac{1.18-1.72}{6-2}=\frac{-0.36}{4}=-0.9$
and for the regression line, $\displaystyle \frac{1.20-1.48}{6-2}=-0.7$
So, we choose (A), because $-0.9\lt-0.7$
