A researcher looking for gender differences in 3-year-olds observes a preschool class and records how many minutes children of each gender play with dolls. What type of descriptive research is this?

Answer: Naturalistic observation

Explanation:

Naturalistic observation is defined as the technique for researching and investigating about the subject present in their particular natural surroundings through observing it. This method is used by psychological researcher.

According to the question, researcher is using naturalistic observation because he is noticing the gender difference between pre-school children and then observing their gender play along with doll.