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?
A) 8
B) 9
C) 10
D) 18

Question

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?
A) 8 
B) 9 
C) 10 
D) 18

Quizplus · Accepted Answer

The degrees of freedom for the numerator is equal to the number of treatments (2) minus 1, which is 1, and the degrees of freedom for the denominator is equal to the total number of observations (20) minus the number of treatments (2), which is 18. Thus, the F ratio has 1 and 18 degrees of freedom in the numerator and denominator, respectively. Therefore, the best choice is B, which corresponds to 9.

Two Accounting Professors Decided to Compare the Variance of Their