Two accounting professors decided to compare the variance of their grading proce

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:
Mean Grade Standard Deviation   Professor 1 86.3       19.6               Professor 2 87.2       8.7            
What are the degrees of freedom for the numerator of the F ratio? 8 18 9 10 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:
Mean Grade Standard Deviation   Professor 1 86.3       19.6               Professor 2 87.2       8.7            
What are the degrees of freedom for the numerator of the F ratio? 8 18 9 10 8 18 9 10 Mean Grade Standard Deviation   Professor 1 86.3       19.6               Professor 2 87.2       8.7            

Explanation / Answer

Since , there are 10 exams conducted by the both the professor

Therefore , n1=n2=10

Therefore , the degrees of freedom for the numerator of the F ratio is n1-1 = 10-1 = 9

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