Fitting Linear Models to Data · Exercise 8

A regression was run to determine whether there is a relationship between hours of TV watched per day $\left(x\right)$ and number of sit-ups a person can do $\left(y\right).$ The results of the regression are given below. Use this to predict the number of sit-ups a person who watches 11 hours of TV can do.

$$\begin{array}{c}y=ax+b\\ a=-1.341\\ b=32.234\\ r=-0.896\end{array}$$

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Algebra and Trigonometry 2e · §4.3 Fitting Linear Models to Data · Exercise 8