Use = 0.05 for all significance tests.

Table below shows salaries for 25 employees in the advertising department at Apple Tree, Ltd. As an initial step in a salary equity study, the human resources consultant performed a linear regression using the proposed model Salary = ₀+ ₁ Male + ₂ Exper + ₃ Ovr50 + ₄ MBA. Exper is the employee's experience in years. Salary is in thousands of dollars. Binaries are used for gender (Male = 0, 1 -- 1 if employee is male), age (Ovr50 = 0, 1 - 1 if employee's age is over 50), and MBA degree (MBA = 0, 1 --1 if employee has an MBA degree)