t-test (group comparison)

About this app

Two groups as overlaid distributions + boxplots: t-statistic, p-value (exact t-distribution) and Cohen's d. The catch — the same mean difference becomes significant with a smaller σ or a larger n, while the effect stays the same.

Subject: Statistics

More from Statistics

• Anscombe's quartet
• Bias-variance / overfitting
• Law of large numbers
• Hypothesis test & p-value
• Confidence interval
• Measures of location & spread
• Measures of location & spread 2.0
• Logistic regression

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