91Ó°ÊÓ

The given statement is:

Which of the following sampling procedures involve the use of probability sampling?

(a) A college student is hired to interview a sample of voters in her town. She stays on campus and interviews 100 students in the cafeteria.

(b) A pollster wants to interview 20 gas station managers in Balti more. He posts a list of all such managers on his wall, closes his eyes, and tosses a dart at the list 20 times. He interviews the people whose names the dart hits

As in process (a), the hired college student selects a sample that does not represent the voters in her town, and also no random device or random number is employed, as is done in probability sampling.

Therefore, Option A does not involve the use of probability sampling.

In contrast, the approach used in (b) is an example of selecting gas station managers at random.

Therefore, Option B involves the use of probability sampling.