Question

Suppose IQ scores were obtained from randomly selected twins. For 20 such pairs of people, the linear correlation coefficient is 0.876 and the regression line is y-hat = 11,76 + 0.89x, where x represents the IQ score of the twin born second. Also,the 20x values have a mean of 101.23 and the 20 y values have a mean of 101.7. What is the best predicted IQ of the twin born first , given that the twin born second has an IQ of 97? Use a significance level of 0.05.