D Question 12 3 pts A pharmaceutical manager is testing a new medication for relief of migraine headache pain. She has 50 volunteers available for the study. She plans to randomly assign 25 subjects to the new medication and 25 subjects to the traditional medication. The mean amount of time to achieve headache relief will then be compared between these two groups. What type of study is this? 15 O a matched pairs experiment O a randomized controlled experiment a randomized block experiment evance O an observational study based on a simple random sample O an observational study based on a stratified sample ort Services O an observational study based on a multi-stage random sample