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?

Question options :

The type of alcohol could be a confounding variable.

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

It is appropriate to analyze the results using a paired sample t-test.

Explanation:

A paired sample t test is used to measure the statistical difference in mean of two groups of observations. It is called a paired sample t test as each subject is measured twice to obtain two groups/pair of observations. This is seen in the above example where subjects take the driving simulation twice to obtain the pair of observations- one for without alcohol and the other with alcohol. paired t test is also called dependent sample t test