Akey fact of white-collar crime is that we hear about only the very slim fraction of people who are caught cheating. most embezzlers lead quiet and theoretically happy lives; employees who steal company property are rarely detected. with street crime, meanwhile, that is not the case. a mugging or a burglary or a murder is usually tallied whether or not the criminal is caught. a street crime has a victim, who typically reports the crime to the police, who generate data, which in turn generate thousands of academic papers by criminologists, sociologists, and economists. but white-collar crime presents no obvious victim. in this excerpt, the authors present:

The author presents a contrast between different types of crime

Explanation:

in the text, the author presented a difference between white-collar crime and street crime.

according to the author, while white-collar crime and criminals are difficult to detect, street crime is easily detected.

Secondly, the author suggested that because there is a specific victim in street crime, they are easily reported and thus data is generated while in white-collar crime, there is no specific target and thus no reportage to law enforcement officers and are thus hardly noticed.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

answer; i believe the correct answer is (general);