Threats to EXTERNAL Validity

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

Reactive Effect to Testing

PRE-TEST can cause a reaction in the subject so that their sensitivity is increased as a result; can increase/decrease post-test result; ALWAYS happens but try to minimize it. NOT THE SAME AS THE TESTING EFFECT!

Reactive Effect to the Experimental Arrangements

The SETTING of the experiment causes a reaction, therefore that data can't be extrapolated to the real world -- e.g. weight loss programs

Multiple Treatment Interference

The effect of a previous medical treatment has on a subsequent medical treatment; requires a WASH OUT period

Interaction of Selection Bias & Experimental Variable

Use of VOLUNTEERS for a group can result in that group having PARTICULAR BIAS or COMPOSITION


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