A study provides data on variables that may be related to the number of weeks a manufacturing worker has been jobless. The dependent variable in the study (Weeks) was defined as the number of weeks a worker has been jobless due to a layoff. The following independent variables were used in the study.

AgeThe age of the worker

Educ The number of years of education

Married A dummy variable; 1 if married, 0 otherwise

Head A dummy variable; 1 if head of household, 0 otherwise

Tenure The number of years on the previous job

Manager A dummy variable; 1 if management occupation, 0 otherwise

Sales A dummy variable; 1 if sales occupation, 0 otherwise

The data are available in the file namedLayoffs

(1)Develop an estimated regression equation that can be used to predict Weeks by using Married and Head. What is the estimated regression equation? (2) Develop an estimated regression equation that can be used to predict weeks given Married, Head, Manager, and Sales. What is the estimated regression equation? (3) Do the two additional independent variables added in part (2) contribute significantly to the estimated regression equation developed in part (1)? Explain.

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