Refer to Exercise 13.77.

a. What is the required condition to apply the t-test of two means to determine whether there is enough evidence to conclude that male heads of households (HHSEX: 1 = Male, 2 = Female) have higher incomes than do female heads of households (INCOME)?

b. Is the required condition satisfied? If not, what technique should be used?

c. Use the technique you chose in part (b) to answer the question about male and female incomes.

In exercise 13.77

In most countries including the United States, men have higher incomes than women. Does this hold when comparing middle class heads of households (HHSEX: 1 = male, 2 = female)?