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Why bother conducting experiments on treatments for COVID-19 ... After we randomly select a sample, we need to use random assignment to assign participants to different experimental groups.
Random assignment to parallel groups, the hallmark of an experimental study, effectively controls all threats to internal validity except experimental mortality.
Experiments begin with random assignment to conditions, which produces equivalent groups. One group is subjected to the changed conditions and the other isn't. The other two necessary components of ...
After we randomly select a sample, we need to use random assignment to assign participants to different experimental groups. Let me begin by referring to the same hypothetical example as in my ...