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Which of the following would be considered as a nonparametric test? I). A test to determine if two events are truly independent of each other. II). A test to determine if the variances of two populations are equal. III). A test to determine if the means of two populations are equal. IV). A test dealing with a data set that's made up of rankings, as opposed to nominal values.
Correct Answer: A
Any test that deals with the mean or the variance of the population is regarded as a "parametric" test. Consequently, all other tests would be regarded as "nonparametric" tests.