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

Degrees of freedom for the numerator = Number of groups being compared minus 1 = 2-1 = 1
Degrees of freedom for the denominator = Total sample size minus number of groups being compared = 10-2 = 8
Therefore, the F ratio has 1 degree of freedom for the numerator and 8 degrees of freedom for the denominator.

Two Accounting Professors Decided to Compare the Variance of Their