ht_twosample_tnonpooled_w(A, B, alpha, type)

Nonpooled T-test for two population means. Hypothesis test for the means of two independent samples A and B. alpha is the confidence level. Parameter type can be 0 (left tail), 1 (right tail), or 2 (both tails).
Assumes samples are independent and that populations are normal or samples are large.
This version rounds down the number of degrees of freedom to the nearest integer.

See also ht_twosample_tnonpooled