Mahmoud completed his first IQ test on the WPPSI-IV scale at age 7.This score had a correlation of +.76 with his IQ score at age 9.How will the correlation of Mahmoud's IQ score at age 23 change in relation to his score at age 7?

Question

Quizplus · Accepted Answer

The correlation between IQ scores tends to decrease as the time interval increases. Therefore, the correlation between Mahmoud's IQ scores at age 7 and 23 will likely be lower than the correlation between his scores at age 7 and 9. The decrease in correlation is estimated at about .20.

Mahmoud Completed His First IQ Test on the WPPSI-IV Scale