A randomised trial, where participants are assigned at random to the treatment\'

Question

A randomised trial, where participants are assigned at random to the treatment' options available, is often referred to as the "gold standard among possible study designs that compare the effectiveness of different treatments. Which of the following is correct? (Tick as many as apply.) This design controls for causal factors (other than the treatment) that are known to affect the outcome of interest. This design rules out competing explanations for any differences in outcome between the treatment groups involved, other than the treatment. This design can only control for variables that affect the outcome of interest and are measured This design controls for causal factors (other than the treatment) that affect the outcome of interest but which are unknown This design ensures that the treatment will have an affect on the outcome of interest

Explanation / Answer

A completely randomized group design is said to do justice and is considered appropriate for experimnetal research. Therefore, a truly randomized design does all of the above except for- only controlling of variables that effect the outcome of interest and are measured (option number 4, counting from above). All other options are applicable.

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