AP Psychology: History & Research Methods 3

Question 1

A researcher manipulates the independent variable to observe its effect on what?

Accepted Answer

The dependent variable

Answer

The dependent variable is the outcome measured to detect the effect of the independent variable.

Question 2

What is the purpose of random assignment in an experiment?

Accepted Answer

To evenly distribute participant differences across groups

Answer

Random assignment spreads participant characteristics evenly, reducing confounding between groups.

Question 3

A double-blind procedure means that neither participants nor whom know who received the treatment?

Accepted Answer

The research assistants administering it

Answer

In a double-blind study, both participants and those administering the treatment are unaware of group assignments.

Question 4

A positive correlation coefficient of +0.85 indicates what?

Accepted Answer

A strong relationship where variables increase together

Answer

A coefficient near +1 shows a strong relationship where both variables rise together.

Question 5

Why can't correlational studies establish causation?

Accepted Answer

A third variable may explain the relationship

Answer

Correlation cannot prove cause because a confounding third variable may account for the link.

AP Practice Test