Question:
Which type of study is most likely to involve a placebo A
Last updated: 4/28/2023
![Which type of study is most likely to involve a placebo A](https://media.kunduz.com/media/sug-question-candidate/20230428120901670812-5517006.jpg?h=512)
Which type of study is most likely to involve a placebo A observational study B controlled experiment C survey
Last updated: 4/28/2023
Which type of study is most likely to involve a placebo A observational study B controlled experiment C survey