This applies to question 20 - 22. A pcial psychologist interested in cultural difference compared women of two ethnic group role. TRO e results were as follows. Approval index on which high in cultural differented creared yoreal of one's own social role. The Ethnic Group A: Ethnic Group B: N = 15 M = 55 S2 = 6.5 N = 23 M = 51 S2 = 4.5 20. If a t test for independent means is conducted, how many degrees of freedom will be used to locate the cutoff score in the t table