Internal validity

causal relationship

internal validity is the degree to which ________ is possible

changes

internally valid if we can be sure that the ________ in the behavior observed across the treatment conditions were actually caused by the IV

other explanations

experiment is not internally valid if _____________ are possible

correct generalization

its not possible if the experiment is not INTERNALLY VALID

confounded experiment

when the value of an extraneous variable systematically changes along the independent variable

extraneous variables

factors that are not the focus of the experiment but can influence the findings

systematic change

change due to one whole group experiences something

infrequent & random events

as long as the extraneous variables' influences are ________________, they do not necessarily invalidate an experiment (2&)

systematically changes

always set up an experiment in which the IV is the only variable that _______________ across the conditions