So sánh phương pháp

	Independent Samples t-test	Kiểm định t của Welch (phương sai không bằng nhau)
Lĩnh vực	Thống kê	Thống kê
Họ	Hypothesis test	Hypothesis test
Năm ra đời	1908	1947
Người khởi xướng	Student (W. S. Gosset)	B. L. Welch
Loại	Parametric mean comparison	Parametric mean comparison (unequal variances)
Công trình gốc	Student (1908). The probable error of a mean. Biometrika, 6(1), 1–25.	Welch, B. L. (1947). The generalization of Student's problem when several different population variances are involved. Biometrika, 34(1/2), 28–35.
Tên gọi khác	student t-test, two-sample t-test, unpaired t-test, bağımsız örneklem t-testi	unequal variances t-test, Welch-Satterthwaite t-test, Welch t-Testi (Eşit Olmayan Varyans)
Liên quan	4	4
Tóm tắt	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.	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.