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Based on the visual pattern described, what specific type of interaction does this line graph depict, and what does it indicate about the effect of the study method?
Case context: A research student plots the results of a factorial study where the x-axis represents a quantitative independent variable (time spent studying: 1, 2, 3, and 4 hours) and the two lines represent a categorical independent variable (study method: Method A vs. Method B). The line for Method A starts at the same y-axis value as Method B at 1 hour of studying, but as time increases to 4 hours, the line for Method A goes sharply upward while the line for Method B remains relatively flat.
Question: Based on the visual pattern described, what specific type of interaction does this line graph depict, and what does it indicate about the effect of the study method?
Sample answer: This line graph depicts a spreading interaction. Because the lines start together and diverge as study time increases, it indicates a growing effect at one level (Method A) but not the other (Method B).
Key points:
- Diagnoses the visual pattern as a spreading interaction.
- Explains that the diverging lines indicate a growing effect at one level but not the other.
Rubric: Full credit is given for diagnosing the interaction as a spreading interaction and explaining its meaning based on the text.
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Research Methods in Psychology - 4th American Edition @ KPU
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