Which of the following is the best definition of variability?
a. It is the amount of dispersion in a data set containing interval or nominal data.
b. It is the difference between scores in the present sample and scores in a previous sample.
c. It is the amount of dissimilarity in ordinal data.
d. It is the amount of dissimilarity (or similarity) in respondents' answers to a particular question.
e. It is the amount of responses in one respondent's answers to a particular survey question.
Answer: d. It is the amount of dissimilarity (or similarity) in respondents' answers to a particular question.