Question: 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

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 birth parents and their adoptive parents. One study examined how much time individuals spend watching TV (Plomin, Corley, DeFries, & Fulker, 1990). The following data are similar to the results obtained in the study.

Amount of time spent watching TV Adopted children Birth parents Adoptive parents Participant Reaction time Errors 2 1 3 3 4 A 184 10 6 4 2 B 213 6 1 1 C 234 2 3 1 D 197 7 2 3 E 189 13 5 3 2 F 221 10 2 1 3 G 237 4 5 3 3 H 192 9

a. Compute the Pearson correlation for the data.

b. In words, describe the speed-accuracy trade-off.

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