Examination for Professional Practice of Psychology (EPPP) Practice Test

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the Examination for Professional Practice of Psychology (EPPP). Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the average reported correlation coefficient for identical twins reared together in relation to IQ?

The correct answer is: .85

The average reported correlation coefficient for identical twins reared together in relation to IQ is considered to be around .85. This high correlation suggests a significant genetic influence on intelligence since identical twins share nearly 100% of their genetic material. This finding highlights the role of heredity in cognitive abilities, indicating that environmental factors also play a role, but the strong correlation points to a substantial genetic component. The other correlation values reflect different relationships. For instance, a correlation of .40 would imply a moderate influence of genetics, which does not align with the strong genetic basis suggested by the .85 value for identical twins. Similarly, a correlation of .68, while indicating a connection, is still lower than the consensus for identical twins, demonstrating that shared genetics in this context exert a stronger effect. Lastly, a correlation of .18 would indicate a very weak relationship, which does not apply to identical twins studied together and suggests minimal genetic influence, contrary to what empirical studies have shown.