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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. More

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. More

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? More

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

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. More

What are confounding factors and how do they affect studies?
Confounding factors can have a huge impact on the results of both controlled and observational studies. More