Indicators For each of these potential predictor variables say whether they should be represented in a regression model by indicator variables. If so, then suggest what specific indicators should be used (that is, what values they would have).

a) In a regression to predict income, the sex of respondents in a survey.

b) In a regression to predict the square footage available for rent, the number of stories in a commercial building.

c) In a regression to predict the amount an individual’s medical insurance would pay for an operation, whether the individual was over 65 (and eligible for Medicare).