Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Sample size allocation and associated tests for the study. ⊂ = “ Proper Subset of “, that is, all elements in the left side group belong within the right side group. ⊃ = “Proper superset of “, that is, all elements in the right side group belong within the left side group. ∩ = “Intersection of “, that is, overlapping elements from both groups.
