1. In this video you will learn two measures of spread: Variance and Standard Deviation
2. The effects of Outliers
3.Standard Deviation and Variance (Grouped Frequency)
4. Learn the effect of additional data and outliers
http://my.hrw.com/math06_07/nsmedia/lesson_videos/msm1/player.html?contentSrc=8020/8020.xml
5. See what the range of a data set is
http://my.hrw.com/math06_07/nsmedia/lesson_videos/alg1/player.html?contentSrc=6382/6382.xml
6.Coefficient of Variation
7. Now practise with Central Tendency and Dispersion
http://my.hrw.com/math06_07/nsmedia/homework_help/msm3_2010/msm3_2010_ch09_04.html
http://my.hrw.com/math06_07/nsmedia/homework_help/msm1_2010/msm1_2010_ch06_02.html
http://my.hrw.com/math06_07/nsmedia/homework_help/alg1/alg1_ch10_03_homeworkhelp.html
http://www.regentsprep.org/Regents/math/algtrig/ATS1/SurveyPractice.htm