welch's t test - SERP Analysis

https://en.wikipedia.org/wiki/Welch%2527s_t-test

https://sites.nicholas.duke.edu/statsreview/means/welch/

https://stats.libretexts.org/Bookshelves/Applied_Statistics/Learning_Statistics_with_R_-_A_tutorial_for_Psychology_Students_and_other_Beginners_(Navarro)/13%253A_Comparing_Two_Means/13.04%253A_The_Independent_Samples_t-test_(Welch_Test)

https://www.statskingdom.com/150MeanT2uneq.html

https://www.geeksforgeeks.org/r-language/welchs-t-test-in-r/

https://www.statology.org/welchs-t-test/

https://www.graphpad.com/guides/prism/latest/statistics/stat_the_unequal_variance_welch_t_t.htm

https://medium.com/data-science/welchs-t-test-the-reliable-way-to-compare-2-population-means-with-unequal-variances-bbf7a62967bc

https://www.youtube.com/watch%3Fv%3DcBJjthfJ_s0