Name the 12 threats to internal validity (I already have them listed below) and explain each one.

Name the 12 threats to internal validity (I already have them listed below) and explain each one.

1. History
2. Maturation
3. Testing
4. Instrumentation
5. Statistical Regression
6. Selection Biases
7. Experimental Mortality
8. Casual Time Order
9. Diffusion or Imitation of Treatments
10. Compensatory Treatment
11. Compensatory Rivalry
12. Demoralization

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