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QUESTION 3 In which circumstance would a researcher need to first establish an operational definition in order to objectively assess its variable? a. researching

QUESTION 3 In which circumstance would a researcher need to first establish an operational definition in order to objectively assess its variable? a. researching the effects of salt on systolic blood pressure Ob.researching the effects of coffee on energy levels Oc. researching the effects of water on the metabolic rate Od. researching the effects of magnesium on the average number of hours of slept at night 0.5 points Save Answer

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