For each factor you want to assess, you would have one group that is subjected to the factor and one that is not. The groups that are not subjected to the various factors are control groups. 4. Why is ...

I would like you to imagine we did not use random assignment in our study of treatment for COVID-19. Unbeknownst to us, our treatment group, compared to the control group, has been populated ...

I would like you to imagine we did not use random assignment in our study of treatment for COVID-19. Unbeknownst to us, our treatment group, compared to the control group, has been populated ...