Recognize the purposes of and differences among sample surveys HSS.IC.B.3 Grade Practice Test Questions TOC | Lumos Learning

Recognize the purposes of and differences among sample surveys HSS.IC.B.3 Question & Answer Key Resources SBAC Grade 11 Mathematics  Master Course 

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A researcher is studying the effect of two pain killers on a population of 1200 elderly adults. She decides to randomly sample 60 of them and gives one-half of them one of the pain killers and the other one-half of them the other pain killer. She then evaluates their level of pain. What type of survey method is this situation using?