In this module, Cate discusses the bias found in the WISC-4 Spanish. Using the normal curve, she plots the mean score of 2 groups- Group A: children from low SES backgrounds and Group B: children from high SES backgrounds. A score of 100 in Group A falls in the 90th percentile while a score of 100 in Group B falls in the 37th percentile. The difference in means can be attributed to groups with different experiences. In conclusion, the test is biased against those from lower SES backgrounds and positively biased for those from higher SES backgrounds.
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