In the Context of Genetic Influences on Intelligence, a Classic

question 2

Multiple Choice

In the context of genetic influences on intelligence, a classic study in Louisville, Kentucky, found that:  

• A)the intelligence quotient scores of dizygotic twins were more alike than scores for any other pairs. 
• B)the correlations in intelligence between dizygotic twins were the same as those between other siblings. 
• C)correlations between the intelligence quotient scores of children and their foster parents and between those of cousins were strong. 
• D)dizygotic twins were more similar than monozygotic twins in spatial memory, ability to categorize things, and word comprehension.

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Definitions:

Covariance

A measure indicating the degree to which two variables move in relation to each other.

Risk-Free Rate

The theoretical return on investment with no risk of financial loss, typically represented by the yield on government securities.

Standard Deviation

A statistical measure that quantifies the amount of variability or dispersion around an average.

Optimal

The most favorable or desirable condition, outcome, or level, often in terms of efficiency or success.