For the Following Question(s): a Sociologist Interested in Cultural Differences

Multiple Choice

For the following question(s) : A sociologist interested in cultural differences compared women of two ethnic groups on a Role Approval Index (high scores mean high degrees of approval of one's social role) . The results were as follows:
Ethnic Group A: N = 15 M = 55 S² = 6.5
Ethnic Group B: N = 23 M = 51 S² = 4.5
-If you conduct a t test for independent means, how many degrees of freedom are in the t distribution?

A) (15-1) + (23-1) = 36
B) 15 + 23 = 38
C) (15 + 23) -1 = 37
D) (15 + 23) /2 = 19