EXERCISING CONTROL OVER VARIABLES
Concept of experimental control includes the ability to:
○
Manipulate one or more IVs;
■
■ Choose the types of DVs that will be measured, and
how and when they will be measured so that the
effects of IVs can be assessed; and
■ Regulate other aspects of the research environment.
CAUSAL INFERENCE AND EXPERIMENTAL CONTROL
Three criteria that must be met in order to make a causal
○
inference on variable Y.
● Covariation of X and Y
● Temporal order
● Absence of plausible alternative explanations
Confounding variable
○
● A factor that covaries with the IV
● Cannot tell whether the IV or the confound affects
the DV
Concept of experimental control includes the ability to:
○
Manipulate one or more IVs;
■
■ Choose the types of DVs that will be measured, and
how and when they will be measured so that the
effects of IVs can be assessed; and
■ Regulate other aspects of the research environment.
CAUSAL INFERENCE AND EXPERIMENTAL CONTROL
Three criteria that must be met in order to make a causal
○
inference on variable Y.
● Covariation of X and Y
● Temporal order
● Absence of plausible alternative explanations
Confounding variable
○
● A factor that covaries with the IV
● Cannot tell whether the IV or the confound affects
the DV
