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Normal Probability Tool


Normal Probability Tool

Logo for Normal Probability Tool
A simple to use JAVA applet that finds Normal probabilities. Simply set mu, sigma, upper and lower scores. Normal Tool shows the area under the curve along with the probability. Detailed instructions are included. Optional web lecture on the Normal Probability Distribution is also included. Two kinds of Assignments are provided under the assignment link--one assignment is computer graded and uses a JAVA applet, the other assignment is a typical story problem homework with answer key in pdf... More
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Material Type: Simulation
Technical Format: Other
Date Added to MERLOT: July 26, 2000
Date Modified in MERLOT: October 21, 2013
Submitter: Thomas Malloy


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Primary Audience: College General Ed
Mobile Compatibility: Not specified at this time
Technical Requirements: JAVA-enabled browser: Netscape 4.7x or higher OR Internet Explorer 5.0 or higher.
Language: English
Cost Involved: no
Source Code Available: no
Accessibility Information Available: no
Creative Commons: unsure


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Discussion for Normal Probability Tool

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Avatar for Julie Nelson
15 years ago

Julie Nelson (Faculty)

I have used the Normal Tool in class as an instructional aid while teaching
statistics for economists. My experience has been that the Normal Tool is an
excellent means of helping students understand key concepts such as the
relationship between the standard deviation and the spread of a distribution,
what probability distributions are (in a meaningful way), and what it means when
a specificr observation falls at a particular point in a distribution. Once my
students get the hang of using the tool (as a group, we use a computer lab so
that I can help them on an individual basis at first), some students get carried
away playing with it and don't want to quit. When they begin to see the
connections between the functions of the Normal Tool and the topics we have been
covering in class, they have "aha" moments that are really pretty exciting for
me. It has made teaching that particular part of my course fun for me and, I
believe, more enjoyable and productive for my students.

With instructions, it takes just a couple of minutes for first-timers to become
comfortable with using the Normal Tool. Once they get it, they're fine on their

I highly recommend using the Normal Tool as a means of helping students obtain a
meaningful understanding of probability distributions, standard deviations,
population parameters, and so on.