In the 1930s, william f. whyte moved into a low-income italian boston neighborhood. for nearly 4 years, he was a member of the social circle of "corner boys" that he describes in street corner society. his goal was to gain greater insight into the community established by these men. what type of research technique did he use?

I believe the answer is: Participant observation

Participant observation refers to a research technique in which the data is collected through direct observation and opinion that is made by the researchers. In general, this technique is used only if the research data is qualitative in nature rather than quantitative.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.

the old way of life was represented by superstition, an angry god, and absolute submission to authority. the thinkers of the age of reason ushered in a new way of thinking. this new way championed the accomplishments of humankind. individuals did not have to accept despair. science and reason could bring happiness and progress. kings did not rule by divine right. they had an obligation to their subjects. europeans pondered the implications for nearly a century. americans put them into practice first.