multiple choice

Used when our population is naturally divided into groups. Take a random sample of groups, and use all the individuals within the selected groups as our sample. a. Volunteer sample b. Simple random sample c. Stratied sample (1. Cluster sample Study design in which the researchers "take control" of the values of the explanatory variable because they want to see how changes in the value of the explanatory variable affect the response variables a. Experiment b. Survey 0. Match- Pair Design d. Observational Study