Which statistical measure is NOT a part of descriptive statistics?

Descriptive statistics are utilized to summarize and describe the characteristics of a data set. This includes measures such as mean, median, and standard deviation, which provide critical insights into the data's central tendency and variability.

The mean is the average of a set of values, while the median provides the middle value when the data set is ordered. Standard deviation measures the dispersion of data points around the mean, indicating how spread out the values are.

On the other hand, hypothesis testing falls into the realm of inferential statistics, which is concerned with making predictions or inferences about a population based on data collected from a sample. It involves testing assumptions or theories, rather than summarizing the data itself, which is the primary goal of descriptive statistics. Thus, hypothesis testing is not a component of descriptive statistics, making it the correct choice in this context.