What Are the Principal Reasons Why a Nonparametric Test of Causality

What are the principal reasons why a nonparametric test of causality is used instead of a parametric one?

A) The assumptions for parametric analyses were not achieved.
B) The effect that the interventional conditions produced was not measurable.
C) The data were not normally distributed.
D) The dependent variable was measured at the ordinal level.
E) The results were not statistically significant.

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