Parametric statistical testing versus the assumptions of nonparametric ?

 Discuss the assumptions of parametric statistical testing versus the assumptions of nonparametric tests. Discuss why a researcher would select a nonparametric approach based on the data and when they would select parametric tests for their data set. Does it matter what type of variables have been collected in the dataset?

Be sure to support your statements with logic and argument, use at least three peer-reviewed articles and cite them to support your statements.