Observational studies #
![Star Trek Red Shirt](https://upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Star_Trek_Red_Shirt.jpg/256px-Star_Trek_Red_Shirt.jpg)
Wikipedia, Derek Springer, CC BY-SA 2.0
People who wear red shirts on the original Star Trek have a high mortality rate.
- can we conclude that red shirts caused the high mortality rate?
- can we solve the problem by having them yellow shirts instead?
Labels: health
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