A randomized experiment, also known as a randomized controlled trial (RCT), is a type of scientific study designed to assess the effectiveness of an intervention or treatment by randomly assigning participants to different groups. The key elements of a randomized experiment include: 1. **Random Assignment:** Participants are randomly assigned to either the treatment group (which receives the intervention) or the control group (which does not receive the intervention or receives a placebo).
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An experiment using randomization to allocate the comparison conditions. With valid implementation and analysis it can support causal inference within the studied setting; it does not by itself establish external validity.