12.5 t-Test Two-Sample

The two-sample T-test is performed on the two specified samples. The null hypothesis is that the difference between the two means is zero.

This test assumes that the two samples are normally distributed. If not, use the Wilcoxon Rank-Sum test.

The confidence interval is an interval around the expected difference between the means.

If the p-value is less than 0.05 then we reject the null hypothesis and accpet the alternative hypothesis, that the means differ, at the 95% level of confidence.

---

Your donation will support ongoing availability and give you access to the PDF version of this book. Desktop Survival Guides include Data Science, GNU/Linux, and MLHub. Books available on Amazon include Data Mining with Rattle and Essentials of Data Science. Popular open source software includes rattle, wajig, and mlhub. Hosted by Togaware, a pioneer of free and open source software since 1984. Copyright © 1995-2022 Graham.Williams@togaware.com Creative Commons Attribution-ShareAlike 4.0