Are there differences between male and female (HHSEX: 1 = Male, 2 = Female) heads of households with respect to family structure (FAMSTRUCT: 1 = Not married or living with partner + children, 2 = Not married or living with partner + no children+ head of household under 55, 3 = Not married or living with partner + no children + head of household 55 or older, 4 = Married or living with partner + children, 5 = Married or living with partner + no children)? Conduct a test to answer the question.