Which one of the following statements is incorrect about the comparison of parametric and nonparametric statistical methods?
a. The efficiency of a nonparametric test is the ratio of the sample size of the best parametric test to the sample size of the nonparametric test.
b. If a set of sample data is such that it can be analyzed by using either a parametric or a nonparametric method, the parametric method is the better choice.
c. There are nonparametric methods for which there is no parametric counterpart.
d. Some nonparametric methods use a z-test statistic. When this occurs, the sample data is from a normal population.
Question 2
The mean, median, and standard deviation of a normally distributed random variable are all at the same position on the horizontal axis since the distribution is symmetric.
Indicate whether the statement is true or false
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