Scenario: A researcher wants to study the effects of childhood stress, genetics, and their interaction for predicting aggression in adults. The researcher recruited 40 subjects, 20 reported they had no childhood stress and 20 reported they experienced severe childhood stress. The researcher is specifically interested in looking at the MAOA gene, because different versions of this gene are linked to aggression. The researcher conducts a genetic test and finds that half of subjects in each group have a gene for low MAOA activity and the other half have the gene for high MAOA activity. The researchers have the subjects self-rate their aggressive behavior over the last 6 months.
Scenario: A researcher wants to study the effects of childhood stress, genetics, and their
interaction for predicting aggression in adults. The researcher recruited 40 subjects, 20 reported
they had no childhood stress and 20 reported they experienced severe childhood stress. The
researcher is specifically interested in looking at the MAOA gene, because different versions of
this gene are linked to aggression. The researcher conducts a genetic test and finds that half of
subjects in each group have a gene for low MAOA activity and the other half have the gene for
high MAOA activity. The researchers have the subjects self-rate their aggressive behavior over
the last 6 months.
1. Given the scenario above, what are the null and alternative
hypotheses?
2. Experimental design:
a. What are the independent and dependent variables in this study?
b. How many levels of each independent variable are there?
c. What type of factorial ANOVA is this?
Step by step
Solved in 2 steps
