Random assignment assumes the probability of something occurring in one group is the same as the probability of it occurring in another group.

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Random assignment is used to ensure that the groups being studied are as similar as possible, so that any differences observed can be attributed to the intervention or treatment being studied rather than to differences between the groups themselves. This is achieved by randomly assigning study participants to different groups, which ensures that there is an equal probability of any characteristic, behavior, or outcome occurring in one group as there is in another group. Therefore, random assignment assumes that the probability of something occurring in one group is the same as the probability of it occurring in another group.

Random Assignment Assumes the Probability of Something Occurring in One