Explain why the researcher's quasi-experimental design successfully avoids the directionality problem compared to the correlational alternative.
Case context: A researcher wants to study the relationship between workspace lighting and employee productivity. Instead of conducting a correlational study where lighting levels and productivity are measured at the same time, the researcher sets up a quasi-experiment: they adjust the workspace lighting (independent variable) at the start of the week and then measure employee productivity (dependent variable) at the end of the week.
Question: Explain why the researcher's quasi-experimental design successfully avoids the directionality problem compared to the correlational alternative.
Sample answer: By adjusting the workspace lighting before measuring employee productivity, the researcher establishes a chronological sequence. This timeline clarifies that the lighting change is the potential cause and productivity is the effect. In contrast, the correlational design measures both at the same time, leaving it unclear whether lighting influenced productivity or if some other factor influenced both simultaneously, which is the directionality problem.
Key points:
- Independent variable (lighting) is manipulated prior to measuring the dependent variable (productivity).
- Chronological timeline clarifies which variable is the cause and which is the effect.
- Simultaneous measurement in correlational designs fails to establish which variable came first.
Rubric: The response should demonstrate comprehension by explaining that: 1) The quasi-experiment manipulates lighting (independent variable) before measuring productivity (dependent variable). 2) This sequence creates a clear timeline that shows which variable precedes the other. 3) In a correlational design, simultaneous measurement prevents determining which variable is the cause and which is the effect.
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