Hi,

Just banging out some questions on T-Stats on CFAI and saw this question.

Assuming that the variances of the underlying populations are equal, the pooled estimate of the common variance is 2,678.05. The *t* -test statistic appropriate to test the hypothesis that the two population means are equal is *closest* to and the answer is 0.94.

The sample sizes for each population are 25 and 18 and sample means are 200 and 185.

I can’t figure out how they got to that answer, can someone help please? The problem for me is that I don’t understand what has been used as the sample in the standard error calculation