Question

to determine customer satisfaction with their service department, an automobile dealer randomly selects 20 hybrid-vehicle owners, 20 suv owners, and 20 sedan owners and sends them a survey. what type of sampling is used?
\bigcirc cluster
\bigcirc convenience
\bigcirc simple random
\bigcirc stratified
\bigcirc systematic
done

Explanation:

1. Recall the definitions of each sampling type:

• Cluster sampling: Divides the population into clusters and randomly selects some clusters. Here, the groups (hybrid, SUV, sedan owners) are not clusters but strata.
• Convenience sampling: Uses easily accessible subjects, which is not the case here as specific groups are targeted.
• Simple random sampling: Every individual has an equal chance, but here groups are selected.
• Stratified sampling: Divides the population into strata (groups with similar characteristics, here vehicle types: hybrid, SUV, sedan owners) and samples from each stratum. The dealer samples 20 from each stratum.
• Systematic sampling: Selects every k-th individual, which is not done here.

1. Since the population (vehicle owners) is divided into strata (hybrid, SUV, sedan owners) and a sample is taken from each stratum, stratified sampling is used.

Answer:

D. stratified