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

Median and Mode;

The only measures of central tendency that can be used for ordinal data.

Values are ranked relative to each other but are not measured absolutely.

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 = )

(This answer was copied/pasted from another question, which I also answered.)