why use an f test for variance can you use an f test to measure variability? why use ftest why use t test when sampling why do you use the f test for variance if a sample is normally distributed, what test is used can you use variance test with f test how to test for variance why does an f test for variance not work why are f-tests used why use f test to test for variance why do f tests for variance when is a variance sample normal what is the test for variance called why do f tests for variance not produce fs what is the normal distribution of f for f test why do we do an f test for variance why use f test variance when comparing variables for variance a f test for variance is necessary why use the f test variance test