• Let's talk about internal validity. Remember how doing experiments basically handle most threats to internal validity. With quasi-experiments, things are a little less sunny. For this discussion board, I want you to:
  • Design a quasi-experiment that tests your project's hypothesis
  • Comment on how the internal validity of your study is threatened under this design

Hypothesis: Adults who experienced trauma during their childhood are more likely to have adverse mental health outcomes, such as depression, anxiety, or PTSD, compared to those who did not experience childhood trauma.

Remember, we have the following threats to internal validity:

• • ambiguous temporal precedence
  • third variable problem
  • selection
  • maturation
  • attrition
  • history
  • instrumentation
  • regression to the mean

You do not have to comment on all these threats. Sometimes, a quasi design handles many of the threats. But, be sure to at least cover two threats to validity in your discussion.