Independent Samples T-Test - Equal Variance

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Where \bar{x} and \bar{y} are the two means and s_x and s_y respectively are their Standard Deviations, and n_x and n_y are their sample sizes respectively, the test statistic is:

t=\frac{\bar{x}-\bar{y}}{s_\bar{xy}},

where:

p = 2\Pr(t_v \ge |t|),
v = n_x + n_y - 2
s^2_{xy} = ((n_x - 1) s^2_x + (n_y - 1) s^2_y) / v , and
s^2_\bar{xy} = s^2_{xy}(n^{-1}_x + n^{-1}_y).
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