DrMartinez Is Doing a Research Study Examining the Effects of a New

Dr.Martinez is doing a research study examining the effects of a new headache medication on migraine pain.He decides to divide his participants up into four subject groups,each one of which will receive a different amount of medication to take when they have a migraine.He will ask them to write down their assessment of how much the pain has dropped on a ten-point scale an hour after taking the medication.What is the independent variable in this study?

A) The intensity of the migraine each participant has before taking the medication.
B) The amount of medication each participant takes.
C) The level of pain reduction reported by each participant.
D) The number of people who are assigned to each of the subject groups.

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