In an experiment designed to determine whether taking vitamin A before attending a social event improves self-esteem, what is the dependent variable?

The Level of self-esteem.

Explanation:

In research, the dependent variable is referred to as a specific variable that is being affected directly by the independent variable and in an experiment or research, it is the variable that is being measured, calculated, or tested by the scientific researcher or experimenter.

The dependent variable is also referred to as the responding variable.

Example: Height of an individual related to his or her different in age.

In the question above, the dependent variable is the level of self-esteem.