PSYC 2210 EXAM 3 VERIFIED STUDY GUIDE
main effect - Answers - The presence or otherwise of statistically significant differences
between the levels of an independent variable in a factorial design.
Interaction - Answers - In a factorial design, occurs when the effect of one independent
variable depends on the level of another independent variable.
factorial design - Answers - Any experimental design with more than one independent
variable.
mixed factorial - Answers - A factorial design with at least one between-subjects factor
and one within-subjects factor
random assignment - Answers - The most common procedure for creating equivalent
groups in a between-subjects design; each individual volunteering for the study has an
equal probability of being assigned to any of the groups.
between subjects - Answers - An experimental design in which different groups of
participants serve in the different conditions of the study.
within subjects - Answers - An experimental design in which the same participants serve
in each of the conditions of the study; also called a repeated-measures design
independent groups design - Answers - A between-subjects design that uses a
manipulated independent variable and has at least two groups to which subjects are
randomly assigned.
dependent samples - Answers - An inferential statistical analysis used when comparing
two samples of data in either a matched groups design or a repeated measures design.
manipulated variable - Answers - factor in an experiment that a scientist purposely
changes; also known as independent variable
subject variable - Answers - A type of independent variable that is selected rather than
manipulated by the experimenter; an existing attribute of the individuals chosen for the
study (e.g., gender).
IV - Answers - The factor of interest to the researcher; it can be directly manipulated by
the experimenter (e.g., creating different levels of anxiety in subjects), or participants
can be selected by virtue of their possessing certain attributes (e.g., selecting two
groups that differ in normal anxiety level)
main effect - Answers - The presence or otherwise of statistically significant differences
between the levels of an independent variable in a factorial design.
Interaction - Answers - In a factorial design, occurs when the effect of one independent
variable depends on the level of another independent variable.
factorial design - Answers - Any experimental design with more than one independent
variable.
mixed factorial - Answers - A factorial design with at least one between-subjects factor
and one within-subjects factor
random assignment - Answers - The most common procedure for creating equivalent
groups in a between-subjects design; each individual volunteering for the study has an
equal probability of being assigned to any of the groups.
between subjects - Answers - An experimental design in which different groups of
participants serve in the different conditions of the study.
within subjects - Answers - An experimental design in which the same participants serve
in each of the conditions of the study; also called a repeated-measures design
independent groups design - Answers - A between-subjects design that uses a
manipulated independent variable and has at least two groups to which subjects are
randomly assigned.
dependent samples - Answers - An inferential statistical analysis used when comparing
two samples of data in either a matched groups design or a repeated measures design.
manipulated variable - Answers - factor in an experiment that a scientist purposely
changes; also known as independent variable
subject variable - Answers - A type of independent variable that is selected rather than
manipulated by the experimenter; an existing attribute of the individuals chosen for the
study (e.g., gender).
IV - Answers - The factor of interest to the researcher; it can be directly manipulated by
the experimenter (e.g., creating different levels of anxiety in subjects), or participants
can be selected by virtue of their possessing certain attributes (e.g., selecting two
groups that differ in normal anxiety level)
