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Why do sick people get better after taking a useless pill? It might just be regression to the mean. Don't be fooled by natural fluctuations.
Screening finds cancer earlier. It does not always make you live longer. It just makes you sick longer.
How do we measure how long something lasts? Survival analysis handles the tricky math of time.
One study is an anecdote. Ten studies are data. A meta-analysis combines them all to find the truth.
Sample size determines the reliability of a study. Small studies are like low-resolution photos: you cannot trust the details.
Why is the RCT the king of evidence? Because it is the only way to kill the confounders.