Multiple Regression Number of Variables and Predictors?

#1
Hi

Could someone please help me with this question I've been staring at my textbook for hours and it doesn't explain how to find no of variable or predictors..

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.

Occupation: accounting, management, marketing, finance.
Industry: manufacturing, healthcare, transportation.
Marital status: married, single.
How many variables will be in the regression model? Delienate the number of predictors needed in each category and discuss the total number of predictors.

Number of variables =

Number of predictors =