Chapter 1, Problem 41RE

High school dropout rates. Table 2 gives U.S. high school dropout rates as percentages for selected years since 1990. A linear regression model for the data is

$r=-0.308t+13.9$

where $t$ represents years since 1990 and $r$ is the dropout rate.

(A) Interpret the slope of the model.

(B) Draw a scatter plot of the data and the model in the same coordinate system.

(C) Use the model to predict the first year for which the dropout rate is less than $3\%.$