Fig. 3.
Mean study time as a function of age group, study condition, and relative position in the singles group. The bars represent standard errors of the means
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.