Answer
$(a)$ See the image below
$(b)$ $y=-3.90179x+419.67857$
$y$ stands for the MRT score and $x$ stands for the noise level
$(c)$ Correlation coefficient $r=-0.9806$.
The linear model is appropriate.
$(d)$ $\approx 52.9\%$
Work Step by Step
$(a)$ See the image above
$(b)$ We can find them using regression line calculator and graphing calculator (see the image above):
$y=-3.90179x+419.67857$
$y$ stands for the MRT score and $x$ stands for the noise level
$(c)$ Correlation coefficient $r=-0.9806$.
Since the $r$ coefficient is very close to $-1$ we can assume that the model is appropriate.
$(d)$ If $x=94dB$
$y=-3.90179\times94+419.67857 \approx 52.9\%$
