Table of Contents
Experiments -controlled method of observation in
which--
Terminology of experiments
More terms
More terms, cont.
Sources of extraneous variability/
threats to internal validity
History
Maturation
Testing
Instrumentation
Statistical Regression
Selection
Experimental Attrition
Practitioner Interaction
Diagramming Group Designs
Preexperimental Designs
Experimental Designs
Classic experiment/Pretest-Posttest Control Group
Solomon 4-Way Group
Posttest-Only Control Group
Multiple experimental group with one control group
Factorial
Quasi-Experimental Designs
Lack randomization or comparison groups
Different group time series
Longitudinal design using different samples
External Validity
Generalizing from the findings from the sample to other times, settings or
groups of people
Replication -mechanism for testing external validity
Advantages & Disadvantages
+ of Group Designs –
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