The following data are salaries of seven randomly chosen managers of furniture-making ?rms and eight randomly chosen managers of paper product ?rms. The data are in thousands of dollars per year.
Furniture: 175, 170, 166, 168, 204, 96, 147
Paper products: 89, 120, 136, 160, 111, 101, 98, 80
Use the Wald-Wolfowitz test to determine whether there is evidence that average owner salaries in the two business lines are not equal.