why use nonparametric when are nonparametric tests appropriate when to do t test when sample size is large when are the assumptions violated for a t test what is the difference between a parametric and a nonparametric test? when is a nonparametric test best used when using nonparametric test, which method should use when comparing two groups when the sample size is large? when to use non parametric analysis should t test include assumptions what are the assumptions in comparing two groups when to use nonparametric test is a parameter test a parametric test why use a nonparametric test can parametric testing be used to compare two groups do you compare two groups with an t test what are two assumptions compared in a nonparametric test? when comparing a pair of observations what is the best method for a nonparametric test can t tests be used to compare two groups when do you use a parametric test when to use nonparametric testing