In high school I took a Probability and Statistics class and my teacher had this really cool setup for doing experiments in statistical inference using random samples. It was a big wooden bowl with 10,000 marbles of various colors, and paddles that had different numbers of holes in them.
I scoured the internet looking for a set that I could purchase to help teach my kids the formulae, but found nothing. So I had to assemble my own.
This is the 100-sample paddle. I may eventually make other sizes. This model works with beads or marbles that are 8mm in diameter.
I designed the part myself using Sketchup.
Overview and Background
Learning the fundamentals of statistical inference is a lot easier when you can design and perform experiments using random samples.
Lesson Plan and Activity
You will need a container large enough to easily facilitate plunging the paddle into the collection of beads or marbles. And you will of course need beads or marbles. I've found that 8mm glass beads work well. I purchased 10,000 clear glass beads from Alibaba for about $150 and then built my own wooden box with a sloping side, but a large 14" wooden salad bowl would also work.
More details are available on my blog: http://snewpy.com/2019/03/experiments-in-statistical-inference/