I If Samples Taken from Two Populations Are Not Independent

i. If samples taken from two populations are not independent, then a test of paired differences is applied.
Ii) The paired difference test has (n - 1) degrees of freedom.
Iii) The paired t test is especially appropriate when the sample sizes of two groups are the same.

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) (ii) is a correct statement, but not (i) and (iii) .