If people are classified by age (over 30/under 30)and by political affiliation (Democrat/Republican),then the point-biserial correlation would be the proper technique to measure the relationship between the two variables.

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Point-biserial correlation is used to measure the relationship between a continuous variable and a binary variable, not between two binary variables. In this case, both variables are binary (over 30/under 30 and Democrat/Republican), so point-biserial correlation is not appropriate. A chi-square test or phi coefficient would be more appropriate in measuring the relationship between these two variables.

If People Are Classified by Age (Over 30/under 30)and by Political