get your Fathom questions answered here

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 […]

*August 14, 2012*

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 […]

*May 30, 2012*

It’s a famous probability problem: given N people in a room, what’s the probability that at least two of them share a birthday? It’s famous because the answer is often surprising: a remarkably small number (23) will give you a probability over 50%. How do you simulate it in Fathom? The key is going to be […]

*May 9, 2012*

This comes from a Fathom listserv query by David Petro: 1. Flip 1000 coins 2. Remove the heads and count up the tails 3. Flip the remaining tails again 4. Repeat 2 & 3 until no coins remain 5. Graph the number of tails after each experiment. This is what I have tried I Have […]

August 17, 20121