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Understand Random Sampling - Instruction - Level G
Apollo wants to know how long students travel to get to his school in the morning. To find out,
he surveys the first 10 students who arrive at school.
What reason can you use to explain why Apollo's sample may NOT
be representative?
The first 10 students to arrive are not part of the population that is
being studied.
The first 10 students to arrive might be the students who live closest
to school.
The first 10 students to arrive might still be sleepy.
The first 10 students to arrive might change from day to day.

Answer 1

The first 10 students to arrive might be the students who live closest to the school.

Apollo’s sampling is not truly random, as he only interviews students who meet the condition of arriving to school fairly quickly. In order to have a truly random sample of students, he should choose 10 students regardless of arrival time.