I had an extra lecture day in research methods and decided to teach about the 2-groups t-test. I wanted a pretty version of the formula to display and thought I would do a google-search and look at images to grab as a slide.
Try it. Search on "t-test formula" and switch to images. No wonder students are confused. The formulas look very different. (And a couple of them look incorrect--depending on how you define N vs. n.)
No wonder students are confused about the t-test formula. Every time they learn about the test, they may be seeing a very different formula.
Ken
--------------------------------------------------------------- Kenneth M. Steele, Ph.D. [EMAIL PROTECTED] Department of Psychology http://www.psych.appstate.edu Appalachian State University Boone, NC 28608 USA ---------------------------------------------------------------
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