In a laboratory experiment on helping behavior, two variables are manipulated: (1) others' presence (whether participants worked alone on a task or with others) and (2) type of task (whether participants were timed or untimed on the task). The dependent measure is the number of seconds between someone's request for help and the participant's response. What type of experimental design is this?
A) posttest-only control group design
B) pretest-posttest control group design
C) 2 × 2 factorial design
D) 2 × 4 factorial design

Question

Quizplus · Accepted Answer

This is a 2 × 2 factorial design because there are two independent variables, each with two levels: others' presence (alone or with others) and type of task (timed or untimed).

In a Laboratory Experiment on Helping Behavior, Two Variables Are