Independent Two-Sample t-Test

  • Compares means from two independent groups.
  • Supports equal and unequal variance (Welch's) methods.
  • Provides test statistic, p-value and confidence interval for the difference.

Input Values

Specify input values and click Calculate. Hover over for help.

Group 1

Group 2

  0.05

Influence of Changing the Difference in Means on the t-Statistic

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Visualisation

This visualisation plots the absolute t-statistic for three sample sizes (equal n per group) as the difference in means varies.

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Table of t-Statistics and p-Values at a range of Mean Differences and Sample Sizes

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Customize the table by changing input values from here.

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t-Statistic and p-Value Table

This table shows Welch's t-statistics (and two-sided p-values) for a range of mean differences and sample sizes (equal n per group).

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