Question

Which samples do you think are non-biased samples of the population of all students at a college/four‐year university? If it is a biased sample, is there a different population for which you believe the sample could be considered a non-biased sample?

1. A random sample of 100 students from the registrar's student list
2. A random sample of 100 students in the library on a Thursday night
3. A random sample of 100 students in the student center on a Friday night
4. A random sample of 100 students at a basketball game on a Tuesday night
5. A random sample of 10 students from 10 randomly chosen dorms on campus
6. A random sample of 100 students from cars registered on campus

Answer 1

Correct option:

A random sample of 100 students from the Registrar's student list

EXPLANATION:

Registrar's student list will contain the list of all the students at a college/ four year university. So, if we select a random sample of 100 students from Registrar's student list, it will be unbiased.

If we select a random sample of 100 students from Library on a Thursday night it will be Non-response biased because only students coming to Library on a Thursday night will be covered.

If we select a random sample of 100 students from Student Center on a Friday night it will be Non-response biased because only students coming to Student Center on a Friday night will be covered.

If we select a random sample of 100 students from basketball game on a Tuesday night it will be Non-response biased because only students coming to basketball game on a Tuesday night will be covered.

If we select a random sample of 10 students from 10 randomly chosen dorms on campus, it will be Non-response biased because only students of dorms on campus, will be covered.

If we select a random sample of 100 students from cars registered on campus, it will be Non-response biased because only students of    cars registered on campus will be covered.