Question: A non-parametric (rank-order) statistical test can be used when a distribution of data is not normal. What is a disadvantage of using a non-parametric test?

A non-parametric (rank-order) statistical test can be used when a distribution of data is not “normal”. What is a disadvantage of using a non-parametric test?
They are more easily understood and recognized
They do not work as well as transforming the scores
They are not widely understood and fail when there are many ties in rank
They can not be used to evaluate significance

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