Under what circumstances should a non-parametric test be used? Explain.© BrainMass Inc. brainmass.com March 21, 2019, 4:23 pm ad1c9bdddf
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If a statistical variable understudy can be represented on a ratio or at least an interval scale of measurement, then it is said to have proper units. With some assumption made about the distribution of the variable (say normality, for example), the variable is fir to be tested parametrically. The t-test, the z-test etc as a few well-known parametric testing methods. But these tests lay different restrictions on the data.
If a statistical variable is of the nominal or ...
A 300-words writeup on Nonparametric tests. Some information about the different parametric and nonparametric tests and their objectives is also presented.