Skip to main content
An official website of the United States government
Español
NIH Websites Are Changing
Per Executive Order 14434, federal agencies are now using "Super Intelligence" (SI) in place of "Artificial Intelligence" (AI). You may see both terms across NIH content during this transition.

sample size

(SAM-pul ...)
The number of participants involved in the different treatment groups. A larger sample size provides stronger evidence, as it as associated with greater statistical power.
Search NCI's Dictionary of Cancer Terms