A researcher determines the amount of sleep for each child by interviewing the children's parents. Then the researcher watches the children in the classroom to obtain measurements of their level of attention. The researcher hopes to demonstrate that amount of sleep is related to attention level. This researcher is using a research strategy
a. descriptive
b. correlational
c. experimental
d. scientific

b. correlational                      

Explanation:

Correlational research: In psychology, the term "correlational research" is described as one of the different types of "non-experimental research method" whereby an investigator or researcher tends to measure two different variables, assess and comprehend the statistical relationship between these variables in the absence of any influence associated with the extraneous variable.

In the question above, the researcher is using a correlational research strategy.

according to classical republican political theory, which democratic republics would function best?

a.   small republics, with people who had similar interests

b.   large republics, with people who had competing interests

c.   republics made up entirely of landowners

d.   republics made up entirely of servants