Problems with Convenience Sampling

Does income cause happiness? It is generally believed that income increases happiness for those who have less money. So a bump in income for a poor person is likely to increase his happiness much more than the same bump in income for a wealthy person.

Siggy, an academic psychologist, was interested in how one-time cash rewards affect happiness. Siggy decided to conduct an experiment by giving people a $10 bill, and then measuring the their corresponding change in happiness at that moment. If Siggy only conducted this experiment on college students (a demographic that is usually strapped for cash, but a convenient sample for academics to conduct experiments on), how might we expect it to bias his experiment's average treatment effect?

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Problems with Convenience Sampling

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