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Definitions
Examples
100
What is the reliability of the measurement used to gauge the IV or the DV?
What is Instrumentation
100
People dropped out a study you conducted because it just wasn't interesting.
What is Experimental Mortality.
200
Changes due to the naturally occuring developmental process.
What is Maturation
200
Because of limited resources you choose only the brightest and dullest students to participate in your test.
What is Regression to the Mean.
300
Changes due to the influence of outside events.
What is History
300
Because you are not very creative your pre-test and post-test are identical.
What is Repeated Testing
400
Changes due to the unique characteristics of the subjects.
What is Selection.
400
Because no one will help you, you do it all: selection, testing and analysis of results.
What is Experimental Bias
500
Changes due to the interaction of subject related and time related variables.
What is Selection-Maturation Interaction.
500
You made your test up at home while watching CSI.
What is Instrumentation.