As part of his senior project, Kevin is conducting a survey of eating attitudes and behaviors among young adults. Kevin distributes questionnaires to 150 randomly selected students enrolled in lower-level psychology courses at his university. These students make up Kevin's

sample.

Explanation:

The 150 students that received Kevin's questionnaire are considered the research sample, while young adults in general would be considered the research population. The whole idea behind using a sample is that you can extrapolate the data obtained from the sample to the whole population.