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Based on the characteristics of the variable assigned to the -axis, explain why the team should choose a line graph rather than another type of graph to plot their results.
Case context: A research team is designing a factorial experiment to study the effect of sleep deprivation and caffeine dose on reaction time. The first independent variable is Sleep State (Deprived vs. Rested). The second independent variable is Caffeine Dose, measured at , , and milligrams. The team plans to assign Caffeine Dose to the -axis.
Question: Based on the characteristics of the variable assigned to the -axis, explain why the team should choose a line graph rather than another type of graph to plot their results.
Sample answer: The team should use a line graph because the independent variable assigned to the -axis, Caffeine Dose, is a quantitative variable (measured in milligrams) that consists of a few distinct levels (, , and milligrams).
Key points:
- Recognize that Caffeine Dose is the variable assigned to the -axis.
- Identify that Caffeine Dose is a quantitative variable.
- Note that Caffeine Dose consists of a few distinct levels.
- Conclude that these specific characteristics make a line graph the standard choice.
Rubric: The student must demonstrate an understanding of the graphing rules by correctly linking the quantitative nature and distinct levels of the Caffeine Dose variable to the appropriate choice of a line graph.
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Research Methods in Psychology - 4th American Edition @ KPU
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