Welch's T-Test Calculator
Compare two means when variances are unequal (heteroscedastic)
About Welch's T-Test
Welch's t-test is an adaptation of Student's t-test for unequal variances.
When to use: When groups have different variances (heteroscedasticity).
Advantage: More robust than Student's t-test; doesn't assume equal variances.
Degrees of freedom: Calculated using Welch-Satterthwaite equation (not nā+nā-2).