91Ó°ÊÓ

We have been that the slope is $3$, which indicates that a mouse’s predicted tail length should increase by about $3$mm for each additional gram of weight.

Given,

$predictedtaillength=20+3×weight$

Hence, slope = $3$.

So, this is correct.

We have been that the predicted tail length of a mouse that weighs $38$grams is $134$millimeters.

Replacing weight in the given formula with $38g$

$predictedtaillength=(20+3×38)mm=134mm$

So, this is correct.

We have been that by looking at the equation of the least-squares line, you can see that the correlation between weight and tail length is positive.

This is correct option.

We have been that if you had measured the tail length in centimeters instead of millimeters, the slope of the regression line would have been $3/10=0.3$.

Since, $10mm=1cm$

So, role="math" localid="1653808608556" $$\begin{gathered} 1mm=1/10cm \\ 3mm=3/10cm=0.3cm \end{gathered}$$

Thus, this is the correct option.

We have been that mice that have a weight of $0$grams will have a tail of length $20$mm.

Replacing weight in the given formula with $0g$.

$predictedtaillength=(20+3×0)mm=20mm$

So, this is correct option.