Assume that your instructor wants to evaluate the potential effects of the amount of caffeine intake on performance in a motor coordination task (playing pinball).Following a specified dose of caffeine,individual scores on pinball are measured.Each participant plays pinball at the same time of day.Also,each participant has been matched for initial skill level at pinball.The independent variable in this study is ____.
A) dose level
B) pinball score
C) time of day
D) skill level

Question

Quizplus · Accepted Answer

The independent variable is the variable that is manipulated by the researcher to observe its effect on another variable. In this study, the amount of caffeine intake (dose level) is manipulated to see its effect on performance in a motor coordination task (playing pinball), making it the independent variable.

Assume That Your Instructor Wants to Evaluate the Potential Effects