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Alternative explainations: Confounds & Artifacts
* Artifacts
* Confound - When you can't tell if the independent variable actually caused the change
Types of Confounds
* Natural Confounds - Things that naturally go together.
* Treatment Confounds - Things we group together.
* Measurement Counfounds - Certain measurement techniques may measure more than just what you want
Time related threats to internal validity
* History
* Maturation
* Statistical Regression