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.

levels of production can be increased by technology while holding labor and capital constant, because increased technology makes the production process more efficient. subsequently, the lras curve is almost a vertical line, that can shift to the right, with an increase in technology.

the relationship between the lras curve and the ppc is that both can make the economy could grow. the ppc achieves that when it shifts outward because of more resources or technological advances while the lras curve shifts if more resources are developed or if there are technological advances.

the lras curve is a vertical line at an output level that represents the number of goods and services a nation can produce over a sustained period using all of its productive resources as efficiently as possible with all of the current technology available to it.

the production possibilities frontier (ppf) is a graphical device that is used for economic analysis of production decisions because the ppf measures the maximum possible combinations of two goods that an economy is capable of producing with its currently available resources and technology.

i would say b. research typically uses a variety of sources