Final answer:
The sample is the 60 families from each school that took the survey while the population is all the families with students in the district schools.
Step-by-step explanation:
In the given scenario, the sample is the 60 families from each school in the district that were surveyed about their primary method of transportation. A sample refers to a smaller group or subset of a larger group chosen to represent that larger group for the purposes of collecting data. On the other hand, the population is all the families in the district who have students attending the schools, since the survey seeks to understand the primary method of transportation for the entire group of families with school-going children within the district. In summary, the sample includes the families surveyed, while the population includes all families in the school district.