10.65 A mechanistic explanation of popularity. Previous experimental work has suggested that the serotonin system plays an important and causal role in social status. In other words, genes may predispose individuals to be popular/likable. As part of a recent study on adolescents, an experimenter looked at the relationship between the expression of a particular serotonin receptor gene, a person’s “popularity,’’ and the person’s rule-breaking (RB) behaviors.²⁵ RB was measured by both a questionnaire and video observation. The composite score is an equal combination of these two assessments. Here is a table of the correlations:

For each correlation, test the null hypothesis that the corresponding true correlation is zero. Reproduce the table and mark the correlations that have P < 0.001 with ***, those that have P < 0.01 with **, and those that have P < 0.05 with *. Write a summary of the results of your significance tests.