Minority group members have a strong sense of group solidarity. which sociologist noted that individuals make distinctions between members of their own group, or the in-group, and everyone else, or the out-group?

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Restricting immigrants from entering a country may be based on what belief?  

Which is relatively better: a score of 76 on a psychology test or a score of 22 on an economics test? scores on the psychology test have a mean of 90 and a standard deviation of 13. scores on the economics test have a mean of 52 and a standard deviation of 10.