Mathematics · Psychometrics Statistics
In psychometrics, which statistical method evaluates item discrimination by correlating a dichotomous item score with the continuous total test score? Furthermore, based on the original ratio IQ formula, calculate the Intelligence Quotient (IQ) of a test-taker who has a chronological age of 8 years and a mental age of 12 years.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Kuder-Richardson Formula 20; IQ = 150
- 2Point-Biserial Correlation; IQ = 150✓
- 3Spearman-Brown Prophecy; IQ = 150
- 4Point-Biserial Correlation; IQ = 66.67
Correct answer
Point-Biserial Correlation; IQ = 150
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