Question

quartiles are: a. divisions of a dataset into four equal parts b. divisions of a dataset into six equal parts c. only used in skewed distributions d. the same as the median

Explanation:

Quartiles divide a dataset into four equal parts. The first quartile ($Q_1$) is the 25th percentile, the second quartile ($Q_2$) is the 50th percentile (median), and the third quartile ($Q_3$) is the 75th percentile. Option b is incorrect as quartiles are not about six - part divisions. Option c is wrong because quartiles can be used in various distributions, not just skewed ones. Option d is incorrect since quartiles include more than just the median (the median is one of the quartiles, but quartiles are a set of three values for a dataset).

Answer:

a. Divisions of a dataset into four equal parts