Based on the information regarding the ethnic group, they'll perform below their true abilities in a situation where it's believed that the test is biased against members of their own ethnic group.
An ethnic group simply means a community or population that is made up of people who have a common cultural background.
It should be noted that when completing a verbal aptitude test, members of an ethnic minority group are particularly likely to perform below their true abilities if the year is biased towards them.
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