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Unformatted text preview: cancer? ● ● ● ●
● SES but simple models are still useful.
3 Why should we be careful not to say it caused
4 • Maybe those indoor tanners with cancer also
spent a lot of time in the outdoor sun.
• Maybe it’s other “bad” behaviors that indoor
tanners have that are causing the skin cancer
(lotion tanning products, radical diets, etc.).
Q: Does indoor tanning cause skin cancer?
Randomly assign people to either...
1) Indoor tanning group
2) No indoor tanning group If outdoor tanning increases the incidence of
skin cancer, some of the people in each of groups
1 & 2 above will do outdoor tanning, and the
outdoor eﬀect will “wash-out...
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