ANALYSIS OF VARIANCE One-Way ANOVA
Dec 23, 2014
2. Researchers were interested in the relationship between the
presence of other people and helping behaviors. In an extension of
the Darleys (1968) classic study, the experimenter (a female
graduate student) asked participants to wait in a room with either
0, 2, or 4 confederates.
The experimenter announces that the study will begin shortly and
walks into an adjacent room. In a few moments the person(s) (0, 2,
or 4) in the waiting room hear her fall and complain of ankle pain.
The dependent measure is the number of seconds it takes the
participant to help the experimenter.
Darley, J. M.; Latan, B. (1968). Bystander intervention in
emergencies: Diffusion of responsibility. Journal of Personality
and Social Psychology 8: 377383.
3. http://faculty.vassar.edu/lowry/VassarStats.html
Number of Confederates
0 2 4
number of seconds
4. Number of Confederates
0 24
95% CI:1.96 (SE)Mean
1.96(2.0881)Mean
=4.699 5= 2.0881
5. 3
6. 35
30
Time (seconds)
95% CIs
1.96 (2.0881)Mean
No difference in response time between 0 and 2
because CIs overlap.
25
0 2 4
NUMBER OF CONFEDERATES PRESENT