Dan, I didn't realize that the t values were more accurate than the normal approximation for n > about 30. I may have learned (incorrectly) that the normal distribution should be used if n > 30, but now that I'm thinking about it, this may have just been computationally economical before computers.
Thanks for this thought. -Kevin Dan Nordlund wrote: You could probably use the Normal distribution as an approximation under these circumstances, but why would you when you have a more accurate CI using t.test? Dan Daniel J. Nordlund Research and Data Analysis Washington State Department of Social and Health Services Olympia, WA 98504-5204 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
