In this fourteenth article in the LabCoat Guide to BioStatistics series, intended as a basic refresher for scientists and technicians, we cover the f-test. The (unpaired) two-sample t-test assumes that the data is sampled from populations that have equal variances, even if their means are different. As part of the (unpaired) two-sample t-test analysis, the f-test is used to test if two samples have equal variances. The f-test computes the ratio of the larger (greater) sample variance (square of the standard deviation, SD) relative to the smaller (lesser) variance. #statistics #biostatistics #experimentalresearch #cropprotection #bioscience #GuideToEssentialBiostatistics #Experimentaldesign
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