| APPLET | SOURCE | DESCRIPTION |
|
| Why Divide by N - 1? | McClelland/ Howell | Draws either 1, 10 or 100 samples of size 3 and then 15 from population with known mean and standard deviation, calculates standard deviation by dividing by both n and n - 1 to illustrate that n - 1 provides more accurate estimates. more |
| Skewness | Interactive Statistics (Lind, Marchal, Wathen) | Calculates skewness coefficient for three datasets, user can change data points and observe changes. more |
| Descriptions of Univariate Data | Wolfram Demonstrations Project | Use slider to change spread as five number summary and measures of dispersion are updated, several datasets available. Requires download of Mathematica player and demo itself, good for classroom demonstration. more |
| Sticky Centers | Univ. of Minnesota, Dept. of Ed Psych | Manipulate post-it notes representing student ages to explore mean vs. median. See AIMS website http://www.tc.umn.edu/~aims/aimstopicsCenter.htm to download worksheets (Lesson 1, Activities 1 and 2) to accompany this applet. more |
| Practice True or False Questions Involving Elementary Statistics | Larry Green's Applet Page | Dozens of true/false questions with instant feedback covering descriptive statistics and sampling techniques, graphical displays, probability concepts, confidence intervals and Z, hypothesis testing, regression analysis, chi-square tests and ANOVA. more |