Question: Question 18 3 pts A research study is conducted to test the effectiveness of a new pain killer. A group of 500 patients are randomly

Question 18 3 pts A research study is conducted to test the effectiveness of a new pain killer. A group of 500 patients are randomly divided into two groups: Group A is given the new medicine while the group B is given a placebo. The patients do not know which group they belong to, but the evaluators/assessors know which patients belong to which group as they interview them about the level of their pain. What type of research study is this? single-blind experiment double-blind experiment case-controlled study observational study O MD Type here to search

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