PSY 3-4 Flashcards
(14 cards)
Identifying main effects and interactions from graphs:
Lines that are parallel indicate no interaction
Lines that are not parallel indicate that an interaction may exist
To analyze the results of a simple design with one IV:
one-way ANOVA
To analyze the results of a complex design with two IVs
Two-way ANOVA
Mixed factorial design
One IV is independent groups,
the other is repeated measures
Higher-order designs:
More than two IVs
When you have two independent variables (IV A and IV B):
perform a two-way ANOVA
- evaluate main effect of A
- evaluate main effect of B
- evaluate interaction
When you have three independent variables (IV A, IV B, and IV C):
perform a three-way ANOVA
- evaluate main effect of A
- evaluate main effect of B
- evaluate main effect of C
- evaluate interactions between all
combinations of two or more IVs
Internal validity:
The degree to which you can confidently conclude that changes in the independent variable caused changes in the dependent variable, without influence from confounding factors.
Validity
The extent to which a study measures what it claims to measure.
External validity
The extent to which the results of a study can be generalized to other people, settings, or times.
Generalization
Applying the findings of a study beyond the specific sample or situation studied to broader populations or conditions.
2 basic types of replication studies
Exact replication & Conceptual replication
Exact replication
Allows you to relate your results to previous results
To confirm a surprising or unexpected result (“extraordinary claims require extraordinary proof”)
conceptual replication
Replication of the conceptual relationship between variables
using different procedures and participants
Measure DV in operationally different ways
