The scatterplot shows the average teacher pay and high school graduation percentage rate for each of the 50 states and the District of Columbia. The regression equation is also shown.

a. Based on the scatterplot is the correlation between average teacher pay and high school graduation rate positive, negative, or near zero?

b. Should the regression equation be used to predict the high school graduation rate for a state with an average teacher salary of $60,000? If so, predict the graduation rate. If not, explain why the regression equation should not be used to make this prediction.

Transcribed Image Text:

HS Grad Rate = 87.58 - 0.00007 Avg Teacher Pay 90 85 80 75 70 40000 50000 60000 70000 80000 Average Teacher Pay High School Graduation Rate (percentage)