Question

Which of these is an example of a non-random sample?

A. At a school assembly, five students are randomly chosen to receive free admission to a theme park.
B. Registered voters in Arizona are surveyed to determine if they have relatives in Florida.
C. Out of all the seventh grade students in a public school district, fifteen are chosen to win a trip to a vacation destination.
D. Airline passengers to Orlando, Florida, are asked about vacation plans.

Answer 1

i feel like the most likely answer is C. A is randomly chosen, B is registered voters. However, they do not say who the voters are, meaning that the voters are most likely random. D has airline passengers, but, like the Arizona residents, the answer does not tell who the passengers are.

C has seventh-grade students and the amount who are chosen to win a trip. Nothing is left out.

Answer 2

ok, that makes sense, thanks!