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.
Results from Study 2: respondents’ mean estimate (20% trimmed mean) of the power of the presented research design for each combination of sample size and expected effect size. The error bars represent 95% confidence intervals, and the lines indicate the true power of studies with the three expected effect sizes as a function of total sample size.
