Which measure of central tendency refers to the value that appears most frequently in a data set? is a measure of central tendency that refers to the value that appears most frequently in a data set.

The other answer is correct, but doesn't give the answer needed, so continuing with that:

Median - Separates data sample, "middle" value.

Mode - The value that appears most often.

Mode is a measure of central tendency that refers to the value that appears most frequently in a data set.

For anyone still looking for the answer = )