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1. Data: sample means x̄1, x̄2; sample variances s1², s2²; sizes n1, n2.
2. Test statistic: t = (x̄1 − x̄2) / sqrt( s1²/n1 + s2²/n2 ).
3. Degrees of freedom (Welch’s approx): ν ≈ (s1²/n1 + s2²/n2)² / [ (s1^4)/(n1^2 (n1−1)) + (s2^4)/(n2^2 (n2−1)) ].
4. Compare |t| to t_ν,α/2 or compute p-value.

"Statistical Methods" by N.G. Das is a comprehensive textbook that covers a wide range of statistical techniques, from basic to advanced levels. The book is designed for students, researchers, and professionals in various fields, including mathematics, statistics, economics, and social sciences. The author's approach is to provide a clear understanding of the concepts, procedures, and applications of statistical methods, making the book an excellent resource for those seeking to improve their data analysis skills. Finding a free, legal PDF download of "