In testing the difference between two independent population means if the variances of the two populations are not equal the critical value of the t statistic is obtained by calculating ___________________. A)degrees of freedom B)the sum of the two sample sizes (n₁ + n₂) C)p-value D)pooled variance

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When the variances of two populations are not equal, the degrees of freedom for the t-test are calculated using a specific formula (Welch's t-test) to adjust for the unequal variances.

In Testing the Difference Between Two Independent Population Means If