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**Confidence Intervals Applet

This applet builds confidence intervals for the percentage of orange candies in box with two colors of candies. A smaller box visualizes the sample, and a graph keeps track of the location of the confidence interval. Students can take one sample (producing one CI) repeatedly, or take 100 random samples at once. The population percentage is hidden from view unless the student asks to see it, in which case it is displayed on the graph of confidence intervals. This allows the students to see whether each interval "hits" or "misses". Several parameters can be varied: sample size, confidence level and number of samples. A set of questions alongside the applet guides students.
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Date Of Record Creation 2010-12-05 14:42:00
Date Last Modified 2010-12-05 14:50:00
Date Of Record Release 2010-12-05 14:50:00
Resource Type
Audience
Format
Author Name Kady Schneiter
Author Organization Utah State University
Technical Requirements Java, web browser
Content Quality (Strengths) The applet is very easy to use, and has very clear graphics. The idea of drawing a sample from a bin of colored marbles is simple and easy for students to grasp. The visual of the bin is good for helping students connect the calculated percentage to a physical entity. Having the parameter re-set to a different unknown value is also a valuable conceptual tool.
Ease of Use (Strengths) The applet is simple and visually appealing. The instructions and questions to consider are well written. The applet is very easy to use with very little or no instruction.
Potential Effectiveness (Strengths) The applet has clear instructions and good questions to consider. It is simple to use and clearly demonstrates a couple of key statistical concepts. Overall, this can be a useful applet.
Content Quality (Rating) 5
Ease of Use (Rating) 5
Potential Effectiveness (Rating) 5
Source Code Available On
Material Type
Statistical Topic
Copyrights
Cost
Intended User Role
Math Level

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