Welch's unequal variances t-test

GPTKB entity

Predicate	Object
gptkbp:instanceOf	statistical analysis
gptkbp:alsoKnownAs	gptkb:Welch's_t-test
gptkbp:alternativeTo	means of two populations are not equal
gptkbp:appliesTo	normally distributed data approximately normal data
gptkbp:assumes	samples are independent
gptkbp:category	parametric test
gptkbp:compatibleWith	equal variances
gptkbp:degreesOfFreedom	calculated using Welch–Satterthwaite equation
gptkbp:developedBy	gptkb:Bernard_Lewis_Welch
gptkbp:field	biostatistics data analysis statistics
gptkbp:form	sample means sample sizes sample variances
https://www.w3.org/2000/01/rdf-schema#label	Welch's unequal variances t-test
gptkbp:implementedIn	gptkb:Python gptkb:SAS gptkb:SPSS gptkb:Excel R
gptkbp:introducedIn	1947
gptkbp:nullHypothesis	means of two populations are equal
gptkbp:output	p-value test statistic
gptkbp:publishedIn	gptkb:Biometrika
gptkbp:relatedTo	gptkb:Student's_t-test
gptkbp:robustTo	heteroscedasticity
gptkbp:usedFor	comparing means of two groups
gptkbp:bfsParent	gptkb:Welch's_t-test
gptkbp:bfsLayer	6