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 0.934 and the equation of the regression line is xy=13.67+1.16x, where x represents the IQ score of the twin born first. Also, the 20 x values have a mean of 98.15 and the 20 y values have a mean of 100.6. What is the best predicted IQ of thetwin born second given that the twin born first has an IQ of 101? Use a significance level of 0.05.

The best predicted IQ of the twin born second is ______?

Explanation / Answer

As

y = 13.67+1.16x

Then if x = 101,

y = 13.67+1.16*101 = 103.49 [ANSWER]

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Hi! The other given won't matter when it comes to just the best predicted IQ. Thanks!

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