STATS at George Mason University
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Yes, let's start with the basics: What are the typical mistakes people make with percentages?

What is the margin of error in a poll?
It would be virtually impossible to conduct a poll on the entire voting population in the United States. Pollsters therefore question a sample of a population.

What is the difference between causation and correlation?
One of the most common errors we find in the press is the confusion between correlation and causation in scientific and health-related studies.

What does it mean for a result to be “statistically significant”?
How can we tell whether two events happen at the same time by chance, or for a reason?

What is the difference between absolute and relative risk?
Which one tells you about the actual risk ?

What is the difference between controlled, observational and case controlled studies?
There are advantages and disadvantages to each type, and an awareness of these differences makes for a savvier consumer of public health information.

What are confounding factors and how do they affect studies?

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