A psychologist who studies the legal system conducted a study of the effect of defendants' likability and nervousness on willingness to convict the defendant. Each participant read the same transcript, taken from an actual trial, in which the guilt or innocence of a male defendant was quite ambiguous. All participants also saw a brief videotape that supposedly showed the defendant on the witness stand. However, the way the actor played the part on the videotape differed for different participants, including the four possibilities of likable versus not and nervous versus not. After viewing the tape, participants rated the likelihood that the defendant is innocent (on a scale of 1, very unlikely, to 10, very likely). The results for the first 12 participants in the study were as follows:

(a) Carry out the analysis of variance (use the .05 significance level).
(b) Make a table of cell and marginal means.
(c) Make a bar graph of the results.
(d) Explain the results and the way you arrived at them to someone who is familiar with the one-way analysis of variance (including the structural model approach) but not with the factorial analysis of variance.

Transcribed Image Text:

Likeable Not Likeable Nervous Not nervous