If the sample data lead us to suspect that the variances of the two populations are not equal, the t-test statistic and the degrees of freedom must be adjusted accordingly.

Question

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When the assumption of equal variances is violated, adjustments to the t-test statistic and degrees of freedom are necessary to maintain the validity of the test, often leading to the use of Welch's t-test.

If the Sample Data Lead Us to Suspect That the Variances