2. Know that straight lines are widely used to model relationships between two quantitative variables. For scatter plots that suggest a linear association, informally fit a straight line, and informally assess the model fit by judging the closeness of the data points to the line.

## NBA top 100 (points per game vs. shots per game)

## High School Dropout Rates vs. Teen Pregnancy Rates

## Crime Rates vs. Unemployment Rates

*Source: Bureau of Labor Statistics, City-Data.com