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Which of the following is a limitation to randomization?

Question 23 

Which of the following is a limitation to randomization? 

  • It may not eliminate conscious bias due to patient or investigator preferences 

  • It does not minimize unconscious bias due to unknown factors 

  • It can make the groups "too alike" on average 

  • It may not be ethical to randomly assign participants to an exposure 

  • It contradicts the option of using a placebo 


Question 24 

Which type of clinical trial focuses on testing preventative measures? 

  • Clinical trial 

  • Community trial 

  • Natural trial 

  • Therapeutic trial 

  • Prophylactic trial 

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