I the Paired Difference Test Has (N1 + N2 -

i. The paired difference test has (n1 + n2 - 2) degrees of freedom.
ii. The paired t test is especially appropriate when the sample sizes of two groups are the same.
iii. A statistics professor wants to compare grades of two different groups of students taking the
Same course in two different sections. This is an example of a paired sample.

A) (i) , (ii) , and (iii) are all correct statements.
B) (i) and (ii) are correct statements but not (iii) .
C) (i) and (iii) are correct statements but not (ii) .
D) (ii) and (iii) are correct statements but not (i) .
E) (i) , (ii) , and (iii) are all false statements.