In the related measures t test, the degrees of freedom equals ...

[CORALGRILL2014]

In the related measures t test, the degrees of freedom equals _____.
 
  a. N - 2 c. n1 + n2
  b. N - 1 d. n1 + n2 - 2

Question 2

In the related measures t test, N is always equal to the number of _____.
 
  a. participants c. difference scores
  b. groups d. treatments

[jointhecircus]

Answer to Question 1

B
Degrees of freedom equals N - 1 in the related measures t test. The calculations are carried out on a single set of scores, each of which represents a difference between a pretest and posttest score.

Answer to Question 2

C
N refers to the number of difference scores. If the same people participate in both conditions, N equals the number of participants, but if there are matched participants, N doesn't equal the number of participants.

[CORALGRILL2014]

Excellent

[bdobbins]

Thanks for the timely response, appreciate it