ASA Connect

Dear ASA Community,

I am looking a free version of Normal and Binomial Calculators for computing probability and / or percentiles for my intro stat class. If you have any resources for this, please let me know. I would greatly appreciate your help in this regard. 

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Sincerely,

Achut Adhikari
Miami University
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Hello Dr. Adhikari,

I recently explored Stat Trek calculators that may be useful for the purpose you mentioned. Please refer to the following links to access those:

https://stattrek.com/online-calculator/normal

https://stattrek.com/online-calculator/binomial

Best,

Nirajan Budhathoki

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Nirajan Budhathoki
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If you'd like a visual/comparison of the Normal approximation to the binomial, I have a shiny app that shows the relationship:

https://shiny.stat.ncsu.edu/jbpost2/NormalApproximation/

You can also add in a continuity correction. Hope this helps!

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Justin Post
Associate Teaching Professor
North Carolina State University
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The Rossman/Chance applet collection has two applets that might fit your needs:

• One Proportion: You can enter binomial inputs (n, pi) and then check Exact Binomial. You can find P(X = x) and tail probabilities.  For percentiles you can move the red line/change the x value.
• Normal probability calculator: You can specify mu and sigma and then enter X or Z or prob and it finds the others, one or two tails. You can visually compare to a second distribution but the outputs are for the first.

If you have any questions about using these, please let me know!

Thanks,

Beth

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Beth Chance
California Polytechnic State University
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