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MindStat SimLab
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Student's t (pooled variance)
Welch's t (unequal variance)
Mann-Whitney U
One-way ANOVA (2 groups)
Normal
Uniform
Exponential
Log-normal
Mean
SD
Normal
Uniform
Exponential
Log-normal
Mean
SD
R
Verify with R Engine
WebR · R 4.6.0 · Welch t Type-I error
Skewed — log-normal
Skewed — gamma
Heavy tails — t (df=3)
Variance ratio 1:4
Unequal n (10 vs 40)
Student's t (pooled variance)
Welch's t (unequal variance)
Mann-Whitney U
One-way ANOVA (2 groups)
Power-vs-n curve
Find smallest n for target power
Normal
Uniform
Exponential (skewed)
Log-normal (heavily skewed)
Rate
(unused)
n =
2
90%
95%
99%
Normal
Uniform
Exponential
Log-normal
Mean
SD
Independent columns
Correlated block
Regression data (y = Xβ + ε)