Menu Home

A Quick Explanation on Why 95% Confidence Intervals Get Smaller (For Non-Epidemiologists)

I’ve been tutoring some students in online MPH programs for a few weeks. We started talking about 95% confidence intervals. All you need to know when reading a confidence interval is that it is used for telling you (the reader) where we (the researcher) are 95% confident that the true measure is located.

Here, let me explain…

This is why polls have confidence intervals but the general election doesn’t. Though, as a friend stated, maybe Florida should have a confidence intervals.

Of course, 95% Confidence Intervals don’t tell the whole story. You have to know what the study is getting at, how it is designed, and what measures you’re comparing. And you have to decide what kind of a confidence interval you can live with.

Categories: Blog

Tagged as:

René F. Najera, DrPH

I'm a Doctor of Public Health, having studied at the Johns Hopkins University Bloomberg School of Public Health.
All opinions are my own and in no way represent anyone else or any of the organizations for which I work.
About History of Vaccines: I am the editor of the History of Vaccines site, a project of the College of Physicians of Philadelphia. Please read the About page on the site for more information.
About Epidemiological: I am the sole contributor to Epidemiological, my personal blog to discuss all sorts of issues. It also has an About page you should check out.

%d bloggers like this: