A special interest group is conducting a survey regarding wolves in Yellowstone National Park. To adequately gauge opinions on b
oth sides of the political spectrum, the researchers took the list of registered Democrats and selected a simple random sample of 100 people. Then, they took a list of registered Republicans and selected a simple random sample of 100 people. Which type of sampling scheme was implemented?
Stratified sampling is accomplished by dividing the population into groups, that is in this case, the randomly selected population is divided into Democrats and Republicans. These groups are called clusters or blocks. The stratas are randomly selected, and each element in the selected clusters are used.
