1. Using unequal groups can also be a threat to internal validity . 2. However, in doing so, you sacrifice internal validity . 3. Statistical regression, history and the participants are all possible threats to internal validity . 4. The apparent contradiction of internal validity and external validity is, however, only superficial. 5. Internal validity is the approximate truth about inferences regarding cause-effect or causal relationships.6. Internal validity is highly important to testing scientific theories because such theories are usually about causality.7. In other words, descriptive research can be said to have a low requirement for internal validity . 8. Internal validity refers to the extent to which a set of research findings provides compelling information about causality.9. These compare control samples to participant samples, which may provide internal validity , but not external validity. 10. The participants had to have no other health problems allowing for the experiment to have accurate internal validity .
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