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Campbell and Stanley (1963) point out that although the two-group pretest-posttest design ensures a degree of internal validity, _____.


A) identifying causal relationships is difficult
B) establishing the statistical significance of your results is difficult
C) it does not preclude problems with external validity
D) None of the answers is correct.

E) A) and B)
F) A) and C)

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When using naturally occurring events as quasi-independent variables, one of the drawbacks is that:


A) such events rarely occur.
B) one has no control over when the event will occur.
C) the events are usually too subtle to have a great impact on behavior.
D) None of the answers is correct.

E) A) and D)
F) B) and D)

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Define a covariate, and indicate how it can be used in an experimental design. What are the advantages and disadvantages of including a covariate in the experimental design?

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A covariate is a variable that is not of...

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In most cases, you have total control over potential confounding variables in a quasi experiment.

A) True
B) False

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The Solomon four-group design allows to test for pretest sensitization effects.

A) True
B) False

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When evaluating the impact of a new policy on the productivity of factory workers, you would most likely use a:


A) pretest-posttest design.
B) cross-sectional design.
C) cohort-sequential design.
D) None of the answers is correct.

E) B) and D)
F) All of the above

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A quasi-independent variable is created by randomly assigning subjects to groups irrespective of the characteristics that the subjects possess.

A) True
B) False

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According to Campbell and Stanley (1963) , which of the following is a remedy for pretest sensitization?


A) Using a cohort-sequential design
B) Simply eliminating the pretest
C) Allowing several weeks to elapse between the pretest and posttest
D) None of the answers is correct.

E) A) and B)
F) A) and D)

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Which of the following is an advantage of a cross-sectional design?


A) It remains unaffected by the influence of generational differences in experience.
B) It permits one to obtain useful developmental data in a relatively short period.
C) It effectively determines whether factors other than age influence the observed changes in behavior.
D) It lets one evaluate the impact of a quasi-independent variable under naturally occurring conditions.

E) C) and D)
F) A) and B)

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Experimental designs fail to determine whether the relationships that exist between variables are causal ones.

A) True
B) False

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You conduct a quasi-experiment to assess the impact of raising the speed limit from 55 to 65 miles per hour. You find out that there were more accidents at higher speeds. Although it is tempting to say that raising the speed limit caused higher accident rates, you must be careful because:


A) you did not actually manipulate an independent variable.
B) drivers may have exceeded the 65-mile-per-hour speed limit.
C) other variables (for example, cheaper gasoline or the season of the year during which the change was instituted) may also be affecting accident rates.
D) None of the answers is correct.

E) C) and D)
F) A) and B)

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Which of the following designs permits researchers to see developmental changes clearly and as they occur, thereby making the design worth the rather large investment of time it takes to collect data?


A) The cohort-sequential design
B) The interrupted time series design
C) The longitudinal design
D) The Solomon four-group design

E) All of the above
F) None of the above

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A particular problem with the pretest-posttest strategy is that participants may be sensitized by the pretest, causing them to perform differently.

A) True
B) False

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The cohort-sequential design eliminates generation effects.

A) True
B) False

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Subject mortality, testing effects, and the cross-generational effects are drawbacks associated with the:


A) cohort-sequential design.
B) cross-sectional design.
C) longitudinal design.
D) None of the answers is correct.

E) A) and B)
F) B) and C)

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Explain how you can include a quasi-independent variable in an experiment. What are the advantages and disadvantages of including the variable in an experimental design?

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Including a quasi-independent variable i...

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One way to combine experimental and correlational variables is to include:


A) a between-subjects and a within-subjects factor in an experimental design.
B) a quasi-independent variable.
C) multiple dependent variables in an experiment.
D) All of the answers are correct.

E) A) and B)
F) A) and C)

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You include a set of four tasks under one level of your independent variable and a different set of four tasks under the other level. Your experimental design is a _____ design.


A) Latin square
B) combined
C) nested
D) completely counterbalanced

E) A) and C)
F) None of the above

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A mixed design is a type of factorial design that combines between-subjects and within-subjects factors.

A) True
B) False

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Discuss the drawbacks associated with quasi-experimental strategies.

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Quasi-experimental strategies, while the...

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