Internet Exercises

Normal Curve/Normal Probability Web Page

http://www.psych.utah.edu/stat/introstats/web-text/Normal_Distribution/

This is a comprehensive interactive presentation of the normal curve. The visualization is very good. Review the lesson and use the visualization tool. Click on the Macromedia Authorware logo at the top of the screen. There is a possibility you may need to download the free plugin or software. The directions on the website are easy to follow. Follow the tutorial and suggested use of the visualization tool.

Use the visualization tool to answer the following question. Assume the height for the population of European males has a mean of 150 cm and a standard deviation of 30.


1		If you were to select one male (sample size = 1) from this population, what is the likelihood his height will be over 170 cm? Make note of this area under the curve.



2		Take a few moments and formulate an explanation (in your own words) of why we can use population parameters and the normal curve to make probability statements. The normal curve/normal distribution is very important in statistics. If it seems a little fuzzy still, review the text and the information on this website again. It sometimes helps to reframe questions to relate to your personal life as well.

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