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If a researcher is interested in knowing how subjects who suffer from migraine headaches will feel if given an ibuprofen, then the explanatory variable is...

If a researcher is interested in knowing how subjects who suffer from migraine headaches will feel if given an ibuprofen, then the explanatory variable is... O the ibuprofen O Whether or not an ibuprofen is taken. O Double blind experiment how much headache relief the subject experiences

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