Mr McGrew Is Interested in the Various Types of Butterflies

Multiple Choice

Mr. McGrew is interested in the various types of butterflies throughout the United States. He is most interested in the differences in flying patterns among butterflies with origins in New England, the gulf states, the midwestern states, and the western states. Mr. McGrew randomly selects butterflies from each area and introduces small temperature changes to their habitat. Mr. McGrew is using a:

A) case study design.
B) factorial design.
C) matched pair design.
D) multigroup design.