Which of the following is NOT a descriptive statistic?a. t-test b. mean c. standard deviation d. rang

To determine which of the options is NOT a descriptive statistic, let's first clarify what descriptive statistics are. Descriptive statistics summarize and describe the characteristics of a data set, including measures like the mean, median, mode, and standard deviation.

1. Option a: t-test - This is a statistical test used to compare the means of two groups and inferential rather than descriptive.
2. Option b: mean - The mean is a measure of central tendency and is a descriptive statistic.
3. Option c: standard deviation - This measures the amount of variation or dispersion in a set of values and is also a descriptive statistic.
4. Option d: range - The range is the difference between the highest and lowest values in a dataset, making it a descriptive statistic as well.

Final Answer

The correct answer is a. t-test, as it is NOT a descriptive statistic but rather an inferential statistic.