Which of the below statements are true? It is saying at least one of my answers

Question

Which of the below statements are true? It is saying at least one of my answers is incorrect

HW 1: Problem 2 Previous Problem List Next True of False: True1. Controlled experiments can be randomized or nonrandomized True2. In a blind experiment, the subjects do not know whether they are in the treatment group or control group. True3. Placebos are used so that even the people who do not receive a treatment can benefit from the study. True4. In an observational study, the investigators assign the subjects to treatment or control. True 5. Using a random chance procedure to assign subjects to treatment or control reduces bias False 6. A placebo is used in all controlled experiments. True7. Placebos are used to randomly assign participants to treatment or control True 8. A well-designed placebo allows an experiment to be conducted blind.

Explanation / Answer

the 7 the one is false..

Placebo r not used for random assignment rather it's used to check the effectiveness of treatment under studey..we use to check a treatments effectiveness with respect to placebo..

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