A researcher surveys a random sample of 750 college students about their political views. The researcher’s survey contains questions about the following variables: Age Political Affiliation (Democrat / Republican / Other) Annual income number of hours worked per week Residential status (on-campus / off-campus) The researcher will conduct a chi-square test of independence. Which pair of variables can the researcher use? age and annual income annual income and number of hours worked per week residential status and number of hours worked per week political affiliation and residential status