If a variable is normally distributed, researchers will need more data to determine the
same information using parametric methods than they would using nonparametric
methods. In other words, parametric methods are not as efficient as nonparametric
methods.

Question

Quizplus · Accepted Answer

Parametric methods assume that the data is normally distributed, which is not always the case. Nonparametric methods do not make this assumption, so they can be used with any type of data. As a result, nonparametric methods are more efficient than parametric methods when the data is not normally distributed.

If a Variable Is Normally Distributed, Researchers Will Need More