Do It Yourself!: Normal Probabilities for Means
Change the values in any cell to compute and to display other probabilities as areas under the normal curve. Be sure to press the Enter key after editing in a cell to record the changes. When this applet loads, the values correspond to Example 7.4 in the text.
- The average duration is less than 7 years. The menu at the bottom of the graph should be set to "Cumulative."
- The average duration exceeds 7 years. The menu at the bottom of the graph should be set to "One-Tailed."
- The average duration lies within 1 year of the population mean mu = 8. The menu at the bottom of the graph should be set to "Middle."
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The applet(s) on this page is from Seeing Statistics,™ an online, interactive statistics textbook. Seeing Statistics is a registered service mark used herein under license. The applet(s) on this page was designed to be used exclusively with Introduction to Probability and Statistics, Eleventh Edition, by Mendenhall, Beaver, & Beaver. (c) 2003, Duxbury Thomson Learning. The applet(s) on this page may not be copied, duplicated, or reproduced for any reason.