Posted by **Ken** on Friday, October 16, 2009 at 8:31pm.

A sociologist interested in cultural differences compared women of two ethinic groups on a Role Approval Index (high scores mean high degrees of approval of one's social role). The results are as follows:

Ethnic Group A: N = 15 M= 55 S2 = 6.5 Ethnic Group B : N = 23 M= 51 S2 = 4.5

If the standard deviation of the distribution of the difference between means is .76, what is the t score?

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