A) enables us to detect whether participants are already engaged in a change process before treatment begins.
B) increases the likelihood that improvemenrom pretest to posttest is a function of statistical regression.
C) makes it more difficult to detect trends in the data..
D) decreases the internal validity of the design.
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A) It is conducted at only one point in time.
B) It can be exploratory, descriptive, or explanatory.
C) It concentrates on the changes that take place within a specific sample over a period of time.
D) It provides a means for studying a large variation in the population at the same point in time.
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A) select a group unlike the experimental group:
B) select a group as similar as possible to the experimental group:
C) use random assignment.
D) avoid the use of switching replications.
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A) administer the treatment to the control group before posttesting.
B) can determine whether the difference between the groups at the first posttest may be attributed to the lack of comparability between the two groups.
C) decrease the chances of determining whether the difference between the groups at the first posttest may be attributed to a selection bias.
D) decrease the internal validity of the design.
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A) using multiple pretests or switching replications.
B) using smaller sample sizes .
C) using no pretests
D) using replication without switching.
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A) Include agency staff in the research planning phase.
B) Keep research staff away from program staff during the study.
C) Avoid developing or using treatment manuals for the experimental or control conditions.
D) Refrain from recruiting clients on an ongoing basis throughout the study.
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Multiple Choice
A) having agency staff implement the case assignment decisions.
B) NOT explaining to agency staff the purpose and nature of the case assignment protocol.
C) pilot testing the randomization procedure in the agency.
D) assigning control of the case assignment protocol to multiple agency staff members.
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A) pretest-posttest control group:
B) time series.
C) nonequivalent comparison group:
D) cross-sectional design.
E) multiple time-series.
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Multiple Choice
A) They are rarely feasible.
B) Data must be collected at multiple points in time.
C) Retrospective data are collected about past differences that might explain differences in outcome.
D) We can usually be highly confident about their internal and external validity.
E) We can usually be highly confident about the direction of causal influence.
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