Question

Identify the type of sampling method used in each situation:

a. At a large university, all instructors in 3 office buildings are interviewed to determine their level of research interest.
b. A manufacturer checks every 20th product on its assembly line for quality assurance.
c. 6 lottery balls are drawn from a hopper of 269 equal size balls.
d. Everyone who walks into the grocery store between 3:00 pm and 5:00 is asked their opinion about a new traffic light being installed next door.

Answer 1

The sampling methods used in the given situations are convenience sampling, random sampling, simple random sampling, and convenience sampling respectively.

Step-by-step explanation:

a. In this situation, the sampling method used is convenience sampling. The researchers are only asking travelers who are sitting near gates and not taking naps, which may not provide a representative sample of all travelers in the airport.

b. The sampling method used in this situation is random sampling. The teacher randomly selects rows two and five to ensure that every student in those rows has an equal chance of being chosen.

c. The sampling method used in this situation is simple random sampling. The selection of the 6 lottery balls is by chance, making it a random sample.

d. The sampling method used in this situation is convenience sampling. The researchers are only asking people who walk into the grocery store between 3:00 pm and 5:00 pm, which may not provide a representative sample of all grocery store customers.