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Which of the following is an important weakness of theexperiment? Because undergraduate students were used as subjects, the results may not generalize to all adults

Which of the following is an important weakness of theexperiment?

Because undergraduate students were used as subjects, the results may not generalize to all adults and all situations involving disposableitems.

The design of the experiment was not a matched pairsdesign.

The experiment was not doubleblinded.

The experiment did not use aplacebo.

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