These two scatter plots show the average income for adults based on the number of years of education completed (2006 data). 16 years of education means graduating from college. 21 years means landing a Ph.D.
What type of correlation does each graph represent?
Both graphs are positively correlated. As years of education increase, so does income.
Draw a line of best fit for each graph then estimate and compare the earnings for each gender with 11 years of education completed.
Based on these plots it looks like a female who completes 11 years of school can expect to earn around $14,000/year while a male can expect to earn around $23,000/year.
These graphs show two important things. First, higher education does lead to a higher income in general. Second, there is a gender gap in income. While women have begun to close this discrepancy, there is more work to do.