In an experiment testing if room temperature (independent variable) affects puzzle-solving speed (dependent variable), a researcher finds no significant difference between the hot room and normal room groups (a null result). However, a manipulation check reveals that the thermostat was broken, and both rooms remained at 72 degrees. Apply this manipulation check outcome to explain how the researcher should interpret the null result.
Question: In an experiment testing if room temperature (independent variable) affects puzzle-solving speed (dependent variable), a researcher finds no significant difference between the hot room and normal room groups (a null result). However, a manipulation check reveals that the thermostat was broken, and both rooms remained at 72 degrees. Apply this manipulation check outcome to explain how the researcher should interpret the null result.
Sample answer: The researcher should interpret the null result as a failure of the experimental manipulation itself. Because the thermostat was broken, the manipulation failed to alter the independent variable (room temperature) as intended, meaning the independent variable's true effect on puzzle-solving speed was not actually tested.
Key points:
- The manipulation check shows that the rooms remained at the same temperature, indicating a failed manipulation.
- The null result should be interpreted as a failure to alter the independent variable as intended, not as proof that room temperature genuinely has no effect.
- The independent variable was not successfully manipulated.
Rubric: The student's answer must apply the manipulation check finding to conclude that the null result is due to a failed manipulation (rooms remained at the same temperature) rather than a genuine lack of effect of temperature on puzzle-solving speed.
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Research Methods in Psychology - 4th American Edition @ KPU
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In an experiment testing if room temperature (independent variable) affects puzzle-solving speed (dependent variable), a researcher finds no significant difference between the hot room and normal room groups (a null result). However, a manipulation check reveals that the thermostat was broken, and both rooms remained at 72 degrees. Apply this manipulation check outcome to explain how the researcher should interpret the null result.