Participants take a simulated driving test twice In one cond

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. Which statement is true?

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.

Which of the following is an independent-measures design?

All participants perform in all conditions.

Each participant is tested twice, once in each condition.

Different participants perform in each condition.

None of the above.

A repeated-measures design would be appropriate for which of the following situations?

A researcher would like to study the effect of alcohol on reaction time.

A researcher would like to compare individuals from at least two populations.

The effect of a new treatment is studied in a small group of individuals with a rare condition.

a and b.

Solution

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. Which statement is true?

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

We can use paired t test since the same participants drived twice.

******************************************

Which of the following is an independent-measures design?

Different participants perform in each condition. [ANSWER]

This one is by definition.

*******************************************

A repeated-measures design would be appropriate for which of the following situations?

The effect of a new treatment is studied in a small group of individuals with a rare condition. [ANSWER]

Here, it is appropriate to use repeated measures becasue you have limited people to work on, so you can repeat measures to produce more data.