Answer:
The sample population is all the students who attend one middle school and one high school in Hollywood, CA.
Explanation:
Population sampling means taking a sample of subjects that represent an entire population.
Here, in the question it is given that Great Gummies visit one middle school and one high school in Hollywood, CA and there they interviewed 50 students from each school.
So, as it was decided that only one middle school and one high school will be visited, so students attending these form the population sample.