When carrying out a controlled experiment, it is important to:

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Changing multiple variables at once can make it difficult to determine which variable is having an effect on the outcome. Subjecting different groups to different conditions can introduce confounding variables that can interfere with the accuracy of the results. Changing only one variable at a time allows for a more controlled experiment and enables the researcher to determine the effect of that specific variable on the outcome.

When Carrying Out a Controlled Experiment, It Is Important To