Correlation studies are often used to help determine whether certain characteristics are controlled more by genetic influences or by environmental influences. These studies often examine adopted children and compare their behaviors with the behaviors of their parents and their adoptive parents. One study examined how much time individual spend watching TV (Plomin, Corley, DeFrieds & Fulker, 1990). The attached data are similar to the results obtained in the study.

question

1. Find a linear model of the relationship between the three variables of interest. Identify the predictor variables and the criterion variable.

Amount of Time Spent Watching T'U' Adapted Birth Adaptive Children Parents Parents 2 [I l 3 3 4 I5 4 2 'l 1 {II 3 1 {II It} 2 3 5 3 2 2 l 3 5 3 3