To determine customer opinion of their safety features, Daimler - Chrysler randomly selects 110 service centers during a certain week and surveys all customers visiting the service centers. What type of sampling is used? a. Simple b. random c. Convenience d. Cluster e. Systematic f. Stratified

Simple sampling - A method where individuals are chosen randomly from a larger set.

Convenience sampling - The sample is being chosen as per ease of access thus it is not a random sampling.

Systematic sampling - Probability method where elements are chosen from a target population.

Stratified sampling - Method where population were divided into different groups called strata and the sample is then drawn from each group.

Cluster sampling - Population is where population were divided into different groups known as clusters. The clusters were then chosen randomly as the samples.

Answer: D (cluster sampling) - The service centers refer as the clusters and it is chosen randomly.