A survey was taken of students at a large university in the fall of 2003; among other things, students were asked to report their age and how much money they had earned the year before.
a. Use software to access the student survey data. Decide which variable should be explanatory, and produce a scatterplot.
b. Tell if either of the variables appears to have outliers, and if so, whether the outliers are high or low.
c. Find the correlation r.
d. Explain why it makes sense for there to be a moderately strong positive relationship between age and earnings.