In some research, the researchers are not able to use random assignments to divide participants among groups. Instead, they compare preexisting groups, which results in a quasi-experimental design.
Random assignments are those which are given as a matter of chance to ensure fairness and equal opportunity for all participants. Here participants forming multiple groups are with similar characteristics. So all groups are the same at the start of the experiment.
A quasi-experimental design applies a non-random method, and subjects are assigned to preexisting groups. There are some situations where true experiments can't be used for practical reasons. In such cases, a quasi-experimental design is a suitable tool.
To learn more about quasi experimental design here
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The Roman Empire simply became too big. Rome became too extended, too expensive to be sustained by the available resources, and no fundamental technological breakthrough was available to enlarge these resources. In the Roman Empire between 235 and 284 C.E, some twenty-six individuals claimed the title of Roman emperor, only one of whom died of natural causes. The population of the Roman empire declined by 25% in the two centuries following 250 C.E, a demographic disaster that meant diminished production, less revenue for the state, and fewer men available for the defense of the empire’s long frontiers.
had been governor of the State of New York.
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The answer is D. Only a small number of people have been arrested.
