You can compare your calculated t value against the values in a critical value chart (e.g., Student’s t table) to determine whether your t value is greater than what would be expected by chance. In this formula, t is the t value, x 1 and x 2 are the means of the two groups being compared, s 2 is the pooled standard error of the two groups, and n 1 and n 2 are the number of observations in each of the groups.Ī larger t value shows that the difference between group means is greater than the pooled standard error, indicating a more significant difference between the groups. The formula for the two-sample t test (a.k.a. You can calculate it manually using a formula, or use statistical analysis software. The t test estimates the true difference between two group means using the ratio of the difference in group means over the pooled standard error of both groups.
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