Skip to content

Margin of Error

Margin of Error:

A margin of error typically refers to a range within which an unknown parameter is estimated to fall, given the variation that can arise from one sample to another. For example, in an opinion survey based on a randomly-drawn sample from a larger population results are usually stated along with a margin of error, also called a confidence interval, that (say) 95% of the time will include the “true” value (i.e. the value you would get by surveying the entire population). It is important to note that most margins of error assume that the sample is drawn randomly; if the sample is not drawn randomly the estimate based on the sample will likely be in error more often than the nominal level of confidence (typically 90%, 95% or 99%).

Browse Other Glossary Entries

Test Yourself

Planning on taking an introductory statistics course, but not sure if you need to start at the beginning? Review the course description for each of our introductory statistics courses and estimate which best matches your level, then take the self test for that course. If you get all or almost all the questions correct, move on and take the next test.

Data Analytics

Considering becoming adata scientist, customer analyst or our data science certificate program?

Analytics Quiz

Advanced Statistics Quiz

Statistics Quiz


Looking at statistics for graduate programs or to enhance your foundational knowledge?

Statistics 1 Quiz

Regression Quiz

Regression Quiz


Entering the biostatistics field? Test your skill here.

Biostatistics Quiz

Advanced Statistics Quiz

Statistics 2 Quiz

Stay Informed

Our Blog

Read up on our latest blogs


Learn about our certificate programs


Find the right course for you

Contact Us

We'd love to answer your questions

Our mentors and academic advisors are standing by to help guide you towards the courses or program that makes the most sense for you and your goals.

300 W Main St STE 301, Charlottesville, VA 22903

(434) 973-7673

By submitting your information, you agree to receive email communications from All information submitted is subject to our privacy policy. You may opt out of receiving communications at any time.