1. Two accounting professors decided to compare the variance of their grading pr

Question

1.  Two accounting professors decided to compare the variance of their grading procedures. To accomplish this, they each graded the same 12 exams with the following results:

What are the degrees of freedom for the numerator of the F ratio?

a) 22

b) 10

c) 12

d) 11

2.

An F statistic is __________.

a) A ratio of two means

b) A ratio of two variances

c) The difference between three means

d) A population parameter

Mean Grade Standard Deviation   Professor 1 89.2       23.5               Professor 2 77.1       9.6            

Explanation / Answer

1. Number of exams each one has graded = 12

Hence,

Degrees of freedom = n1 - 1 = 12 - 1 = 11

Option D is correct.

2. Option B is correct.

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