Multiple Choice
A researcher is interested in the effect of caffeine on a driver's braking speed.She takes four groups of participants and gives each group a different dose of caffeine,then measures their reaction time.Which of the following statements is true?
A) The dependent variable has four levels.
B) The independent variable has four levels.
C) The independent variable is reaction time.
D) The dependent variable is the number of groups.
Correct Answer:
Verified
Correct Answer:
Verified
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