Chapter 4, Problem 4.62RE

(a)

To determine

To predict the brain weight of the new mammal species that is discovered.

Answer to Problem 4.62RE

The brain weight is expected to be about $800$ grams.

Explanation of Solution

The new mammal species discovered has body weight of $600$ Kg.

The point ( $600,800$ ) seems to lie on the regression line and thus if the body weight is $600$ kilograms, the brain weight is expected to be about $800$ grams.

(b)

To determine

To find out the slope of the line and explain why.

Answer to Problem 4.62RE

The slope is $1.3$ .

Explanation of Solution

Let us use the point from (a) again and we also know that the line seems to go through the origin. The slope is then the changes in y divided by the changes in x :

  $\begin{array}{l}\frac{800-0}{600-0}\\ =\frac{800}{600}\\ \approx 1.3333\end{array}$

Thus we then note that the slope has to be $1.3$ .