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Pre-test/Post-test controls for...
interactions with selection,
regression to the mean
Why use a post-test only design?
increased protection from testing effects
BUT lower protection from selection effects
Why use Solomon 4-group design?
main advantage is a gain in external validity
How is a single case design different from a case study?
case study is descriptive
no variables manipulated in CS
no variable control in CS
What is a quasi-experimental design?
a design where we cannot use random assignment to groups but do manipulate an IV and measure a DV
: non-equivalent and interrupted time series