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	Welchov t-test (nerovnaké rozptyly)	Nezávislý t-test pre dva výberové súbory
Odbor	Štatistika	Štatistika
Rodina	Hypothesis test	Hypothesis test
Rok vzniku	1947	1908
Tvorca	B. L. Welch	Student (W. S. Gosset)
Typ	Parametric mean comparison (unequal variances)	Parametric mean comparison
Pôvodný zdroj	Welch, B. L. (1947). The generalization of Student's problem when several different population variances are involved. Biometrika, 34(1/2), 28–35.	Student (1908). The probable error of a mean. Biometrika, 6(1), 1–25.
Ďalšie názvy	unequal variances t-test, Welch-Satterthwaite t-test, Welch t-Testi (Eşit Olmayan Varyans)	student t-test, two-sample t-test, unpaired t-test, bağımsız örneklem t-testi
Príbuzné	4	4
Zhrnutie	Welch's t-test is a parametric hypothesis test that compares the means of two independent groups without assuming their variances are equal. It was introduced by B. L. Welch in 1947 as a more robust generalization of Student's two-sample test for situations where the two groups have different spread.	The independent samples t-test is a parametric hypothesis test that compares the means of two independent groups to decide whether they differ significantly. It builds on the t-distribution introduced by Student (W. S. Gosset) in 1908 and assumes the measured values are continuous, approximately normally distributed, and have equal variances.