Browsing All posts tagged under »t-Test«

Paired Tests in Fathom

June 8, 2012

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This is one of those, “oh, yeah” and slap your forehead things. Suppose you have data on which you want to do a paired test. The prototypical paired test is a pre-post test of some kind. Let’s call these scores pre and post. The basic idea is this: compute the pre-post change and test whether […]

Two-tailed tests, one-tailed tests

June 8, 2012

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No one is making requests, but there have been searches on this site about tests with different numbers of tails. So here, without ado, is how you specify whether a Fathom test should be one or two-tailed, and if one-tailed, which one: First, check out this post about Fathom’s test objects in general. The key […]

How to Do a t-Test in Fathom

May 3, 2012

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How do you do a regular old t-test, no randomization? It’s easy, but different from how you do it in other programs. 1. Make a “test” object. Look at the shelf (a.k.a. toolbar), find the “test”, and drag one into your document. 2. Choose the kind of test you want from the menu. Here, we’re […]