The partial megastat output below is regression analysis of the relationship between annual payroll and number of wins in a season for 28 teams in professional sports. The purpose of the analysis is to predict the number of wins when given an annual payroll in $millions. Although technically not a sample, the baseball data below will be treated as a convenience sample of all major league professional sports. 
Refer to the printout above. How many degrees of freedom for Residual (Error) ?
Definitions:
Aggressive Behaviour
Actions or behaviors that intend to cause harm or pain to others, often manifesting as physical or verbal hostility.
Correlation
A statistical measurement that indicates the extent to which two variables fluctuate together.
Midterm
An examination or assessment taking place in the middle of an academic term.
Final Exam
A test given at the end of a course to assess a student's understanding of the material.
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