Question: IQ Scores of Twins Separated at Birth IQ scores were obtained from randomly selected twins separated at birth. For 20 years such twins, the linear correlation coefficient is 0.870 and the equation of the regression line is y= -3.22+1.02x, where x represents the IQ score of the twin that was born first. Also, the 20 x values have a mean of 104.2 and the 20 y values have a mean of 103.1. What is the best predicted IQ of a younger adopted child, given that the older adopted child in the same family has an IQ of 110?