Dr. Bellus wants to study how people's perception ofattractiveness is affected by the gender of the subjects, and thefacial expression of the object. Each participant views sixheadshots (in random order) of the same person, who demonstratesdifferent facial expressions (joy, surprise, fear, anger, sadness,and disgust) in each picture. The participants are then asked torate the attractiveness level of each picture. The rating is thedependent variable. Below is the selected output of a two-factorsplit plot ANOVA.
Source | Type III SS | DF | MS | F |
Between subjects | | | | |
A | 226.81 | 1 | 226.81 | 3.04 |
S | 2084.61 | 28 | 74.45 | |
| | | | |
Within Subjects | | | | |
B | 18802.53 | 5 | 3760.506 | 38.07 |
A*B | 324.22 | 5 | 64.84 | 0.66 |
B*S | 13829.70 | 140 | 98.78 | |
(a) Identify the between-subjects factor and within-subjectsfactor.
(b) Are the effects significant (? = .05)? What do these resultstell us about people's perception of attractiveness?
(c) Is MCP necessary? If so, which effect(s) should we conductMCP on?
