השוואת שיטות

	ניתוח גודל אפקט	מבחן t למדגמים בלתי תלויים
תחום	סטטיסטיקה	סטטיסטיקה
משפחה	Hypothesis test	Hypothesis test
שנת המקור	1969 (first edition); 1988 (definitive second edition)	1908
הוגה השיטה	Jacob Cohen	Student (W. S. Gosset)
סוג	Standardized magnitude estimation	Parametric mean comparison
מקור מכונן	Cohen, J. (1988). Statistical Power Analysis for the Behavioral Sciences (2nd ed.). Lawrence Erlbaum Associates. ISBN: 978-0805802832	Student (W. S. Gosset) (1908). The probable error of a mean. Biometrika, 6(1), 1–25.
כינויים	effect magnitude estimation, standardized effect measure, practical significance analysis, ES analysis	two-sample t-test, unpaired t-test, Student t-test, independent groups t-test
קשורות	4	4
תקציר	Effect size analysis quantifies the practical magnitude of a statistical result independently of sample size. Rather than asking only whether a difference or relationship is statistically significant, it asks how large it is, using standardized indices such as Cohen's d, eta-squared, omega-squared, or Pearson's r that allow direct comparison across studies and populations.	The independent samples t-test is a parametric hypothesis test that determines whether the means of two independent, unrelated groups differ significantly on a continuous outcome variable. Derived from Gosset's 1908 t-distribution, it is one of the most widely used inferential tests in social, behavioral, biomedical, and experimental sciences.