Suppose IQ scores were obtained from randomly selected twins. For 20 such pairs

Question

Suppose IQ scores were obtained from randomly selected twins. For 20 such pairs of people, the linear correlation coefficient is 0.865 and the equation of the regression line is Modifying Above y xy=3.95+0.98x, where x represents the IQ score of the twin born secondtwin born second. Also, the 20 x values have a mean of 96.87 and the 20 y values have a mean of 99.05. What is the best predicted IQ of the twin born firsttwin born first, given that the twin born secondtwin born second has an IQ of 94? Use a significance level of 0.05.

Explanation / Answer

for x = 94.

y = 3.95 + 0.98(94) = 96.07.

So, the predicted IQ = 96.07 for the younger twin.

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