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.
The relation between type-I error and sample size when a t test, a t test on logarithms and a Wilcoxon rank test are applied to log-normal data. Here, the effect size is 0.0 implying that the null hypothesis of “no difference” is true, because the type-I error is “the probability of falsely rejecting the null hypothesis when it is true”. The sample sizes shown are the number of subjects in each of the two groups
