Skip to content

Level Of Significance

Level of Significance:

In hypothesis testing, you seek to decide whether observed results are consistent with chance variation under the “null hypothesis,” or, alternatively, whether they are so different that chance variability can be ruled out as an explanation for the observed sample. The range of variation of samples that are consistent with the null hypothesis is examined, and if the observed sample is “too far out,” the null hypothesis is rejected. The line you choose to divide “too far out” from “not too far out” is the level of significance. If you decide that the observed results must be more extreme than all but 1% of the samples that might be generated by the null model, then the level of significance is 1%.

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.