SHORT-ANSWER
1. Identify the two major reasons why psychologists conduct experiments.
2. Identify and briefly define the three primary types of control that are used in experiments.
MULTIPLE-CHOICE
3. When researchers use the multimethod approach they can reach comparable conclusions about a research question after using different methods to study it. Our confidence in these conclusions increases and the conclusions are said to have:
A. convergent validity.
B. concurrent validity.
C. multiple validity.
D. crossing validity.
4. One major purpose of conducting experiments is to decide whether a treatment or program effectively changes behavior. The second major purpose for doing experiments is to provide:
A. definitive answers to theoretical questions.
B. simple and relatively quick ways of testing and revising hypotheses.
C. methods to obtain results that demonstrate that what we expect from our hypothesis will be confirmed.
D. an empirical test of hypotheses derived from theories.
5. The factors that researchers control or manipulate in order to determine their effect on behavior are called the:
A. independent variables.
B. dependent variables.
C. intervention variables.
D. confounding variables.
6. In a study that investigates the effects of two different doses of a drug on memory performance, the drug doses represent the ____ variable and memory performance represents the ____ variable.
A. correlational, confounding
B. dependent, independent
C. independent, dependent
D. experimental, control
7. A researcher has manipulated only one independent variable at two levels, has held constant as many other variables as possible and has balanced individual differences by using random assignment. The researcher is likely to be able to claim that the independent variable caused the observed changes in the dependent variable because the experiment is:
A. externally valid.
B. reliable.
C. a pretest-posttest design.
D. internally valid.
8. Which of the following arises when the independent variable of interest and a potential independent variable are allowed to covary?
A. contamination effect
B. confounding
C. decrease in external validity
D. illusory correlation
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