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Group 1: 12 11 10 9 11 10 12 8 9 10 Group 2: 15 14 16 13 14 15 16 14 13 15Open calculator with these values
If p ≤ 0.05, the difference in means is statistically significant.
Welch t-test is robust to unequal variances and sample sizes.
Always interpret p-values together with effect size.
When should I use Welch t-test?
When comparing two independent groups without assuming equal variances.
What does the p-value mean?
It measures evidence against the null hypothesis of equal means.
Should I also report effect size?
Yes. Effect size shows practical importance, not just statistical significance.