. Which statement is the scientific rationale for a control group of participants in an investigational protocol?  1. A control group is used to compare the responses to the medication group for...

. Which statement is the scientific rationale for a control group of participants in an investigational protocol?

 1. A control group is used to compare the responses to the medication group for efficacy of the medication. 2. The control group is used to prove that the side effects of the medication are not caused by anything else. 3. The researcher cannot determine effectiveness of the medication unless there is a control group. 4. The researcher uses the control group to gauge the amount of medication needed to treat the disease