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Standard Errors
This table gives the sample statistic, population parameter, population standard error, and sample standard error functions for mean, proportion, difference between means, and difference between proportions.




http://www.webcalculator.co.uk/statistics/SampleSize/Standar...



Descriptive Statistics, Measures of Central Tendency, and Dispersion
This tutorial describes various measures of central tendency, their theory and use, and demonstrates them with an example on final exam scores. Data is given as well as SPSS and Minitab code. Key Words: Mean; Median; Mode; Variance; Standard Deviation.




http://www.nyx.net/~tmacfarl/STAT_TUT/cent_tnd.ssi



Introduction to Descriptive Statistics
This tutorial introduces mean, median, mode, variance, and standard deviation using sports statistics from the Internet and classgenerated statistics. Students should understand stemandleaf plots before using this tutorial. This material is intended for class use. Excel spreadsheets with sample data are also available for download. The relation links to a letter for teachers.




http://www.mste.uiuc.edu/hill/dstat/dstat.html



Mean and Variance of Random Variables
This site gives an explanation, a definition and an example of mean and variance of random variables. Definitions and properties are also included.




http://www.stat.yale.edu/Courses/199798/101/rvmnvar.htm



Virtual Statistician
This site contains lessons which include steps, examples, and a calculator, on standard deviation, Pearson's r, ttest, oneway ANOVA, and Tukey's Post Hoc Test.




http://web.mst.edu/~psyworld/virtualstat.htm

