Question

ch 8 to assess the opinion of students at the ohio state university about campus safety, a reporter for the student newspaper interviews 15 students she meets walking on the campus late at night who are willing to give their opinion.
the sample obtained is

○ a stratified random sample of students feeling safe.

● probably biased.

○ a simple random sample of students feeling safe.

○ a probability sample of students with night classes.

Explanation:

The reporter interviews 15 students walking on campus late at night who are willing to give their opinion. This is a convenience sample (students available late at night and willing to respond), which is not representative of all Ohio State students (e.g., excludes those not on campus late, not willing to respond). Thus, the sample is probably biased. A stratified random sample would involve dividing the population into groups and sampling from each; a simple random sample would randomly select from all students; a probability sample of students with night classes would target that group, none of which match this sampling method.

Answer:

probably biased.