Chapter 1.3, Problem 13E

Undergraduate enrollment. Table 8 lists enrollment in U.S. degree-granting institutions for both undergraduate and graduate students. A linear regression model for undergraduate enrollment is

$y=0.23x+9.56$

where $x$ represents years since 1980 and $y$ is undergraduate enrollment in millions of students.

(A) Draw a scatter plot of the undergraduate enrollment data and a graph of the model on the same axes.

(B) Predict the undergraduate student enrollment in 2025 (to the nearest 100,000).

(C) Interpret the slope of the model.