Browsing All Posts published on »June, 2012«

Sampling Without Replacement: Lottery Problem

June 14, 2012

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Yay! A request! From Ben Ceyanes on the APstat listserve: Ok, So I am brand new to fathom and to AP Stats this year and I am getting frustrated trying to figure out how to simulate a problem on fathom.  The problem says that a person buys 5 lottery tickets with 6 numbers ranging 1 to […]

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 […]