Confidence Interval Stairway?

[lhawkins@urbanschool.org]

In teaching our 11-12 graders about confidence intervals, we usually created 90% Box Plots experimentally (using coins & Fathom/CODAP) and theoretically for a given true population proportion. Then I had been using a confidence interval stairway generated from various theoretical true p‘s to help them work backwards to interpret a sample proportion.

Any chance someone has made a CODAP file to replace the Fathom file we used to do this? This was the Fathom file we used. And here is a video of me using a paper CI stairway, and then the Fathom stairway, so you can see what I mean. (Please excuse any errors – this is from one of my first times teaching it!)

Thank you!

Laura

[Bill Finzer]

Hi Laura,

Sorry to be so long in getting back to you. Your post got stuck in a spam filter but I think we’ve got that figured out now.

I was able to make something that might be useful to you. It’s here. A screenshot of the graph is shown below. Some notes and directions are contained within.

Bill

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