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) A particular data point has the residual -2.5. Where is that data point located with reference to the regression line itself?

Choices:

a> on the line

b> above the line

c> below the line

d> cannot determine

ii) One observation is (32, 28 IQ points). What is its residual?

a> -1.04 IQ points

b> 1.04 IQ points

c> -2.63 IQ points

d> 2.63 IQ points

e> 0 IQ points

e> cannot be determined