A researcher gathered 155 observations on four variables: job satisfaction, occupation, industry, and marital status. She wants to develop a multiple regression model to predict job satisfaction by the other three variables. All three predictor variables are qualitative variables with the following categories.
1. Occupation: accounting, management, marketing, finance.
2. Industry: manufacturing, healthcare, transportation.
3. Marital status: married, single How many variables will be in the regression model? Delineate the number of predictors needed in each category and discuss the total number of predictors.