I the Paired Difference Test Has (N₁ + N₂ -

question 23

Multiple Choice

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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