Question 18 (10 points) The following data shows annual income, in thousands of dollars, categorized according to the two factors of gender and level of education. Assume that incomes are not affected by an interaction between gender and level of education, and test the null hypothesis that gender has no effect on income. Use a 0.05 significance level. Female Male High school 23, 27, 24, 26 25, 26, 22, 24 College 28, 36, 31, 33 35, 32, 39, 28 Advanced degree 41, 38, 43, 49 35, 50, 47, 44