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effect of the independent variable

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If we do not observe a sufficiently large between-groups variance, then we have not observed __________

experimenter effects, an effect of the dependent variable, enough samples, or an effect of the independent variable

I believe - enough samples - is the answer.

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This solution targets effect of the independent variable.

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You are incorrect in your belief. If you do not observe a sufficiently large between-groups variance, this means that there is not a significant variability due to treatment effects.

When we conduct experiments in ...

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