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A psychologist investigates the relationship between anxiety levels and test performance but recruits only participants whose anxiety scores fall within a narrow, moderate range. If a strong negative correlation between anxiety and test performance exists in the broader population, the psychologist's restricted sample is likely to produce a weaker correlation coefficient than what would be observed using a more representative sample.
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Research Methods in Psychology - 4th American Edition @ KPU
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Which of the following best describes the statistical issue known as 'restriction of range'?
A psychologist investigates the relationship between anxiety levels and test performance but recruits only participants whose anxiety scores fall within a narrow, moderate range. If a strong negative correlation between anxiety and test performance exists in the broader population, the psychologist's restricted sample is likely to produce a weaker correlation coefficient than what would be observed using a more representative sample.