Question: The following data resulted from a study in which 34 sets of identical twins raised apart were compared with regard to IQ. Studies like these

The following data resulted from a study in which 34 sets of identical twins raised apart were compared with regard to IQ. Studies like these help us further our understanding of the nature vs. nurture debate.

Here is your data. The correlation coefficient for this data set is 0.792, and the regression equation is calculated to be y-hat = 1.839 + 0.850(x).

i) What is the predicted IQ for a second twin whose first born twin sibling has an IQ of 25? What is the predicted IQ for a second twin whose first born twin sibling has an IQ of 35?

Choices:

a> 27.34 IQ points, 31.59 IQ points

b> 23.1 IQ points, 31.59 IQ points

c> 23.1 IQ points, 31.59 IQ points

ii) What is the value of the sum of all 34 residuals?

a> 0 IQ points

b> 1 IQ points

c> 2 IQ points

d> 3 IQ points

e> cannot be determined

0 IQ points

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