For which of the following types of Studies is it impossible to draw a cause-and-effect conclusions? I). Completely randomized experiments II). Randomized block experiments III). Observational studies

For which of the following types of Studies is it impossible to draw a cause-and-effect conclusions? I). Completely randomized experiments II). Randomized block experiments III). Observational studies

Naim 12:33

For which of the following types of Studies is it impossible to draw a cause-and-effect conclusions?
I). Completely randomized experiments
II). Randomized block experiments
III). Observational studies



A. I only
B. II only
C. III only
D. It is never possible to draw a cause-and-effect conclusions.
E. It is always possible to draw cause and effect conclusions.





Answer: C


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