For this week’s reflection, consider the following points:
Explain the research situations that may require you to use quasi-experimental and single-case experimental methods (be sure to give examples/be specific).
Examine the limitations and benefits learned about these methods and their use.
Analyze any ethical considerations with implementing these methods.
Reflect on your experience with this week’s Review Question activity.
Include any questions you may have for your professor.
Length: 2-3 pages, not including the title page (and resource page if applicable)
These are the concepts that were focused on this weeks assignment
“Key Terms
quasi-experimental research designquasi-independent variableone-group posttest-only designone-group pretest-posttest designnonequivalent control groupselection differencesnonequivalent control group posttest-only designnonequivalent control group pretest-posttest designbasic time series designinterrupted time series designcontrol time series designlongitudinal designcross-sectional designcohortcohort effectsgeneration effectscohort-sequential designsingle-case experimental designreversal designABA designphasesbaseline phase (A)multiple-baseline designchanging-criterion designstabilitymagnitude
Review Questions
A quasi-experimental research design is structured similar to an experiment, with what two exceptions?State whether each of the following factors is an example of an independent variable or a quasi-independent variable. Only state “quasi-independent variable” for participant variables that cannot be manipulated.
The age of participantsTime allotted for taking an examA participant’s work experienceTime of day a study is conductedA participant’s state of residenceAmount of sugar added to a drinkHow does a one-group pretest-posttest design improve on the posttest-only quasi-experimental design? What is the major limitation of all one-group designs?What is a nonequivalent control group, and why does this type of group make it difficult to determine cause and effect using a nonequivalent control group quasi-experimental design?What is the key difference between the basic and interrupted time series quasi-experimental research designs?Name the developmental research design described in each of the following examples:
A researcher measures job satisfaction in a sample of employees on their first day of work and again 1 year later.A researcher records the number of nightmares per week reported in a sample of 2-year-old, 4-year-old, and 8-year-old foster children.(A) Cohort effects are a threat to what type of validity? (B) Which developmental research design is most susceptible to cohort effects?Why is the single-case design regarded as an experimental research design?A reversal design is used to test the hypothesis that low lighting in a room reduces how quickly students read. As shown in the figure for one student, a student reads passages of similar length in a room with normal lighting (baseline), then in the same room with dim lighting (treatment), and then again with normal lighting. Do the results shown in the figure support the hypothesis? Explain.
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