9. The Maleo Company has compiled the following table from the files of five of its employees to study the impact on income of three factors: age, education (expressed in number of college years completed), and experience (expressed in number of years in the business).

Age (yr) Education (yr) Experience (yr) Annual income ($)

30 4 5 40,000 39 5 10 48,000 44 2 14 38,000 48 a 18 36,000 37 3 9 41,000