to find how high school students feel about h...
to find how high school students feel about hot lunches, adam walks to the nearest high a survey postcard to every twentieth student that enters the building. he asks the students postcard in if they choose to participate in the study. select all sampling methods used. cluster convenience simple random stratified systematic voluntary done
Answer
# Brief Explanations:
1. **Systematic**: Adam selects every twentieth student, which is a fixed - interval selection characteristic of systematic sampling.
2. **Voluntary**: He asks students to return the postcard if they choose to participate, indicating a voluntary response from the students.
# Answer:
systematic, voluntary