Chapter 3, Problem T3.8SPT

To determine

To find: the predicted increase in temperature for an increase of equal chips per minute.

Answer to Problem T3.8SPT

  ${16.5}^{\circ }F$

Explanation of Solution

Given:

Regression equation for least-squares

  $\widehat{y}=25.2+3.3x$

Calculation:

  $\text{replacing}x\text{by}x+5$

  $\begin{array}{l}\widehat{y}=25.2+3.3\left(x+5\right)\\ =(25.2+3.3x)+16.5\end{array}$

It is observed that if $x$ is increased by 5, then the expected value $\widehat{y}$ increases by ${16.5}^{\circ }F$

Hence, the correct option is (b)