There are many statistical tests within Student's t test ( t test), ANOVA and ANCOVA, and each test has its own assumptions. Most parametric test has an alternative nonparametric test. For non-normal continuous variable, median is representative measure, and in this situation, comparison between the groups is performed using non-parametric methods. Mean is the representative measure for normally distributed continuous variable and statistical methods used to compare between the means are called parametric methods. For these methods, testing variable (dependent variable) should be in continuous scale and approximate normally distributed. Student's t test ( t test), analysis of variance (ANOVA), and analysis of covariance (ANCOVA) are statistical methods used in the testing of hypothesis for comparison of means between the groups.
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