An independentmeasures research study uses a total of 40 par

An independent-measures research study uses a total of 40 participants to compare two treatment conditions. What is the df value for the t statistic for this study?

a.

18

b.

19

c.

38

d.

39

Solution

As the df for a 2 sample t test is

df = n1 + n2 - 2

and n1 + n2 = 40 participants,

df = 40 - 2 = 38 [ANSWER, OPTION C]