Teachers' Pay and Costs of Education
The figure shows a scatterplot with a regression line for teachers' average pay and the expenditure per pupil for each state for public schooling in 2007, according to The 2009 World Almanac and Book of Facts.
a. From the graph, is the correlation between teachers' average pay and the expenditure per pupil positive or negative?
b. Interpret the slope.
c. Interpret the intercept or explain why it should not be interpreted.