You have data for many families on the parents' income and the years of education their eldest child completes. When you make your scatterplot,
a. the explanatory variable is parents' income, and you expect to see a negative association.
b. the explanatory variable is parents' income, and you expect to see a positive association.
c. the explanatory variable is parents' income, and you expect to see very little association.
d. the explanatory variable is years of education, and you expect to see a negative association.
e. the explanatory variable is years of education, and you expect to see a positive association.
Answer: b. the explanatory variable is the parents' income, and you expect to see a positive association.