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Research Methods Chapter 13
Terms in this set (22)
a research design in which the researcher cannot assign participants to conditions and/or manipulate the independent variable
the independent variable in a quasi-experimental design
One-group Pretest-Posttest Design
a pre experimental design in which one group of participants is tested before and after a quasi-independent variable has occurred (this design should never be used)
Regression to the Mean
the tendency for participants who are selected on the basis of their extreme scores on some measure to obtain less extreme scores when they are retested
a design that lacks the necessary controls to minimize threats to internal validity
Nonequivalent control group design
a quasi-experimental design in which the group of participants that receives the quasi-independent variable is compared to one or more groups of participants who do not receive the treatment
Nonequivalent Groups Posttest-only design
a quasi-experimental design in which two preexisting groups are studied- one that has received the quasi-independent variable and one that has not
a threat to internal validity that arises when the experimental groups were not equivalent before the manipulation of the independent or quasi-independent variable
a situation that occurs when participants in one experimental condition are indirectly affected by the independent variable in another experimental condition because they interacted with participants in the other condition
Nonequivalent groups pretest-posttest design
a quasi-experimental design in which two preexisting groups are tested- one that has received the quasi-independent variable and one that has not; each group is tested twice- once before and once after one group receives the quasi-independent variable
Local history effect
a threat to internal validity in which an extraneous event happens to one experimental group that does not happen to the other groups
Time series designs
a class of quasi-experimental designs in which participants are tested on many occasions- several before and several after the occurrence of a quasi-independent variable
a threat to the internal validity of a quasi-experiment that develops when another event occurs at the same time as the quasi-independent variable
Interrupted time series design with a reversal
a study in which 1) the dependent variable is measured several times; 2) the independent variable is introduced; 3) the dependent variable is measured several more times; 4) the independent variable is then withdrawn; 5) the dependent variable is again measured several times
Interrupted time series design with multiple replications
a study in which 1) the dependent variable is measured several times; 2) the independent variable is introduced; 3) the dependent variable is measured again; 4) the independent variable is withdrawn; 5) the dependent variable is measured; 6) the independent variable is introduced a second time; 7) more measures of the dependent variable are taken; 8) the independent variable is once again withdrawn; 9) the dependent variable is measured after the independent variable has been withdrawn for the second time
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