An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects ten schools from the district and interviews all of the teachers at the selected schools. Which type of sample did she use in this study?

Random sample

Explanation:

Random sample: In psychology, the term "random sample" is described as a sample that is being chosen or selected randomly. It is generally used by the researchers or investigators to avoid any unwanted effects or bias.

In the question above, the education expert used random sample for her study as all teachers gets equal chance of being selected.