when is the levene test used in a group t test what is the difference between levene test and f ratio why levene test of equality of variance why is levene test better than f ratio in spss why use levene test why f ratio test is used why levene test for equality of variance why spss is using the levene test why test equality of variance in spss what is the difference between a levene test and an f ratio what test does spss use for equality of variance why is the levene test used in independent group t test why spss use the levene test why use the levene test why use levene test why use the levene test why is a levene test used in the independent group t test? why is the levene test used for the independent group t test why use levene test why use levene test