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More notes. Laptop died halfway through lecture though :(
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|+Alternative explainations: Confounds & 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|
|+* Statistical Regression|