Why do we use random assignment? Using random assignment lowers the probability

Question

Why do we use random assignment? Using random assignment lowers the probability of confirmation bias. Using random assignment spreads unrelated individual differences across all conditions so that they should not influence the experiment's results. Using random assignment increases the probability that our results can be replicated. Why do we use random assignment? Using random assignment lowers the probability of confirmation bias. Using random assignment spreads unrelated individual differences across all conditions so that they should not influence the experiment's results. Using random assignment increases the probability that our results can be replicated.

Explanation / Answer

Correct answer: Option (C) Using random assignment increases the probability that our results can be replicated.

Concept:

Random assignment or random placement is an experimental technique for assigning human participants or animal subjects to different groups in an experiment (e.g., a treatment group versus a control group) using randomization, such as by a chance procedure (e.g., flipping a coin) or a random number generator. This ensures that each participant or subject has an equal chance of being placed in any group. Random assignment of participants helps to ensure that any differences between and within the groups are not systematic at the outset of the experiment. Thus, any differences between groups recorded at the end of the experiment can be more confidently attributed to the experimental procedures or treatment.

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