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Participants take a simulated driving test twice. In one condition they have no alcohol, in the other they have enough alcohol to take them over

Participants take a simulated driving test twice. In one condition they have no alcohol, in the other they have enough alcohol to take them over the legal limit. For this study, which statement is true?

It is appropriate to analyze the results using a paired sample t-test
The experiment has two dependent variables
The experiment has two independent variables
The type of alcohol could be a confounding variable

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