Given the quantitative responses recorded from a short test: [2, 3, 2, 5, 3, 2, 4, 2, 3], what is the mode?

2

There is no mode because the dataset contains more than two different values and therefore does not have a single center.

3

3 and 2 are both modes because they each appear multiple times and seem most common after eyeballing, so we should report them together to be safe.