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.

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The Answer of 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.

I the Paired Difference Test Has (N1 + N2 -

I the Paired Difference Test Has (N₁+ N₂-