Lisa is conducting a study to determine the genetic diversity of opossums in the state of Michigan. She sampled DNA from 26 opossums that she found dead on roadsides (i. e. roadkill). She found 20 opossums in Lower Michigan and 6 in the Upper Peninsula. What is the sample size in Lisa's study?

The answer to the question: What is the sample size in Lisa's study, would be: 26.

Explanation:

Lisa is conducting a study on genetic diversity in opossums. In the selection criteria that Lisa used to choose the group of animals from which she would extract samples for the study, Lisa decided to go for those that she found dead on the roadside, or roadkill. Another criteria that she used was the selection of participants that were from different geographical locations, which would increase the probabibily of genetic variations in the same animal species. Given these criteria, Lisa got herself a total sample of 26 animals, 20 from Lower Michigan, and the remaining 6 from the Upper Peninsula. It is from these 26 animals that Lisa made her sample, and from which she will extract the necessary information for her study.