Carol has identified a group of five-year-old boys to be studied in her cross-sectional research design. what other group will she likely include in this research?

Ten year old boys

Explanation:

Cross sectional research design are usually used to understand the dominant character or features in a population at a particular point in time. Some of the characteristics of a this study design are; takes place at one time, allows researchers to compare certain characteristics such as age, can provide information about what is happening with a certain population and what is happening in another population say 5 years later, and then use this information as a basis of comparison. Researchers do not use this study to show cause-and-effect, but it is used mainly for correlational analysis.

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.