Two accounting professors decided to compare the variance of their grading procedures.To accomplish this they each graded the same 10 exams with the following results: 
What are the degrees of freedom for the numerator of the F ratio?
Definitions:
Actual Data Points
The real, observed values or measurements recorded during an experiment or study.
Fitted Values
Predicted values calculated from a statistical model, used to compare against actual values observed in the data.
Simple Linear Regression Model
A statistical method for modeling the relationship between a single independent variable and a dependent variable by fitting a linear equation.
Slope
In mathematics, the slope of a line is a number that describes both the direction and the steepness of the line, often calculated as the rise over run in linear functions.
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