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 0.853 and the equation of the regression line is xy=6.86+0.93x, where x represents the IQ score of the twin born second twin born second. Also, the 20 x values have a mean of 97.44 and the 20 y values have a mean of 97.9 What is the best predicted IQ of the twin born first twin born first, given that the twin born second twin born second has an IQ of 106? Use a significance level of 0.05.

The best predicted IQ of the

twin born firsttwin born first

is ______

Explanation / Answer

y=6.86+0.93x

If x=106

y=6.86+0.93*106=105.44

The best predicted IQ of the

twin born first twin born first

is _105.44_____

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