Question

Question
Select the correct answers from the lists.(1 point)
Decide whether the following case study is an observational or experimental study and explain your reasoning.



In the Salk Polio Vaccine Study, researchers studied whether the newly developed polio vaccine worked. Thousands of children randomly received either the polio vaccine or a fake shot (placebo). Researchers then tracked how many children in each group got the disease. Children who got the vaccine were much less likely to get polio. This led to widespread use of the vaccine and a big drop in polio cases around the world.



This is an
I know this because

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Answer 1

This is an experimental study.

I know this because researchers randomly assigned children to receive either the vaccine or a placebo (an active manipulation of the treatment with a control group), which allows causal conclusions about the vaccine’s effect.