Fathom Downloads

July 1, 2014

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Get the good news—and the bad news—here. (If you’re just reading the summary, the link doesn’t work. Click to get the whole “article” Or go to the top and click the link to the “Fathom 2.x Status” page.)

Posted in: Uncategorized

Sampling until you get all six

June 4, 2013

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A common problem goes like this: There are six different Famous Statistician cards, one (randomly) in each box of Chocolate Sugar Bombs. How many boxes do you need to buy to get all six? This is a good three-collection simulation in Fathom, and uses two little-used features, sample until and the uniqueValues( ) function. Make […]

Posted in: How-to, measures, simulation

Using summary tables in simulations

August 17, 2012

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In the apstat community thingy, Rudy Medina posted a problem, and Paul Myers posted a solution. I’ll show another solution, and maybe veer off into philosophy. Here’s the problem (from 16 August 2012): A bus stop has 7 stops and 4 passengers.  If every passenger is equally likely to get off at any stop, what is […]

Streak Lengths

August 14, 2012

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We humans see streaks as indications of non-randomness, but streaks do occur in genuine random phenomena—usually more than we think. There are famous activities about this, like the one where you ask students to (secretly) create “realistic” sequences of 100 heads-or-tails coin flips along with genuine sequences from a fair coin. The wise, omniscient teacher […]

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 […]

Posted in: How-to, measures, simulation

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 […]

Posted in: How-to

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 […]

Posted in: How-to