The following ANOVA table is from a multiple regression analysis: 
The number of independent variables in the analysis is ___.
Definitions:
Marijuana-Related Problems
Issues arising from the use of marijuana, including dependency, legal consequences, and health complications.
Marijuana
A psychoactive drug from the Cannabis plant used for medical or recreational purposes.
Job Stress
The emotional and physical strain caused by one's work environment and duties, potentially leading to negative health outcomes.
Smoking Behavior
The actions or patterns of tobacco use, including the frequency and reasons behind smoking.
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