Random sampling concerns how individuals are selected to be in a study. It is important for generalizing the results obtained from a sample to a broader popu- lation, and it is therefore very important for survey research. Random assignment concerns not who is selected to be in the study but rather how participants in the study are assigned to different conditions. Random assignment is essential to ex- periments because it is necessary for determining cause-and-effect relationships; without it, there is always the possibility that any differences found between the conditions in a study were caused by preexisting differences among participants. Random sampling, in contrast, is not necessary for establishing causality. For that reason, and because random sampling is difficult and expensive, very few experi- ments use random sampling.
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