Question

You are serveying students to find out their opinion of the quality of food served in the school cafeteria you decide to pull only those students who buy hot lunch on a particular day is your sample random explain?

Answer 1

The sample is wrong, becuase if you want to do a good research you must consider all the students , the students that have lunch there and the students that do not eat there.

Also, you must consider if they eat hot or cold lunch.

If you only consider some students the research is incomplete.

Also consider taking the survey on different days and at different hours.