Question

determine whether descriptive or inferential statistics were used.
a survey found that 16.8 days was the average number of vacation days that employees had taken during the year.
this is an example of select statistics.

Explanation:

Descriptive statistics summarize or describe data (like calculating an average of a dataset from a survey here, without making inferences about a larger population). Inferential statistics is about making predictions/inferences about a population from a sample. Since the survey just reports the average (a descriptive measure) of the vacation days from the surveyed employees, it's descriptive.

Answer:

descriptive