Final answer:
Descriptive statistics are used to calculate measures of central tendency of a set of scores.
Step-by-step explanation:
Descriptive statistics are used to calculate measures of central tendency of a set of scores. They describe and summarize the data by providing values such as the mean and standard deviation. These descriptive statistics help in understanding and discussing the data, as well as identifying patterns and trends.
Therefore, the correct answer to the question is c. calculate measures of central tendency of a set of scores.