Nonparametric statistics should be used when we ______.

A) cannot assume we have normally distributed data
B) can assume we have normally distributed data
C) do not know the sample size
D) have continuous variables

Nonparametric statistics are used when we cannot assume a normal distribution in the data. They do not depend on specific distribution assumptions but rather on the ranking or ordering of the data. Nonparametric methods can be used for both continuous and categorical variables, and do not require knowledge of the sample size.