Raven's - Educational - Case study

CPM/CVS

John Clark is 8 years and 4 months old. He was referred for an assessment of his general abilities and the CPM and CVS were both administered as measures of non-verbal and verbal abilities respectively. He was attentive and co-operative throughout the assessment.

On the CPM he obtained a total raw score of 29. This score converted to a standard score of 105 and a percentile rank of 63, and therefore it is estimated that 63% of the normative population will obtain lower scores than him. His standard score of 105 has a 97.5 confidence interval between 95 and 115. His age equivalent score is at the level of a 9-year old.

On the CVS he obtained a total raw score of 30, which converted to a standard score of 85 with a percentile rank of 16. His standard score of 85 has a 97.5 confidence interval between 75 and 95. His age equivalent score is at the level of a 6 and a half year old.

A discrepancy analysis between his CPM and CVS scores showed that the difference between his scores was statistically significant. The cumulative percentage of this difference in the standardisation sample showed that this level of difference occurred within 33.5% of the sample.

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