Question

1. A researcher measured people’s physiological reactions while watching horror films and compared them to when watching erotic films, and a documentary about wildlife. Different people viewed each type of film. The resulting data were skewed. What test should be used to analyze the data?

a. Kruskal-Wallis test

b. Independent analysis of variance

c. Repeated-measures analysis of variance

d. Friedman's ANOVA

Answer 1

C.

Repeated measures ANOVA is a member of the ANOVA family. ANOVA is short for ANalysis Of VAriance. All ANOVAs compare one or more mean scores with each other; they are tests for the difference in mean scores. The repeated measures ANOVA compares means across one or more variables that are based on repeated observations. A repeated measures ANOVA model can also include zero or more independent variables. Again, a repeated measures ANOVA has at least 1 dependent variable that has more than one observation.

The repeated measures ANOVA is an ‘analysis of dependencies’. It is referred to as such because it is a test to prove an assumed cause-effect relationship between the independent variable(s), if any, and the dependent variable(s).