To determine if a new pain medication if effective, researchers randonly assign two groups of people to use the pain meditation in a group 1 anf a placebo in group 2. both groups are asjed to rate their oain and the resultd are compared. What type of study is this? A: Survey
B: Observational
C: Experinental
D: This is not a statistical question​

C: Experimental

Step-by-step explanation:

This is an experimental study because you have two separate groups (the control and experimental groups) you are comparing and manipulating the results.

chemists are often responsible for designing a chemical reaction and analyzing the products obtained from it. one significant part of designing a chemical reaction is determining the amount of each reactant that is needed and the amount of each product that will be produced. in order to do so, chemists use stoichiometry, the quantitative relationships between reactants and products.