Which of the following statements is true regarding choosing appropriate statistical techniques

a. When researchers need to examine multiple variables, a bivariate statistical technique is required.
b. With nominal data, the mean is most appropriate measure of central tendency.
c. Parametric statistics are appropriate when the data is measured using an interval or ratio scale and the sample size is large.
d. Nonparametric statistics are used in the case of a normal distribution.
e. When data is measured using an ordinal or nominal scale it is generally appropriate to use parametric statistics.

Answer: c. Parametric statistics are appropriate when the data is measured using an interval or ratio scale and the sample size is large.