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 Mean and Median This applet, created by Rice University's Virtual Lab in Statistics, allows students to manipulate a histogram and observe changes in the mean and median. The site includes links to exercises and descriptions of measures of center and spread. Overall, this is a nice learning device to teach students about statistics, and more specifically, histograms. http://www.ruf.rice.edu/~lane/stat_sim/descriptive/index.htm...
 Variance and Standard Deviation This resource, created by author David M. Lane, is a general reference which helps to define and explain variance and standard deviation. The website is fairly simple, users just select the term they wish to define. The site's simplicity is one of its best qualities, it can be easily understood by any level of students studying statistics. References to other quality statistic web pages are also... http://davidmlane.com/hyperstat/desc_univ.html
 Scatter Plot (Engineering Statistics Handbook) This resource, created by authors James Filliben and Alan Heckert, provides an explanation of scatter plots, their use, purpose and interpretation. It uses examples of the various relationships described by scatter plots as well as case studies and related techniques. Overall, this is a solid representation of this graphing process and could be used by almost any statistics classroom. http://www.itl.nist.gov/div898/handbook/eda/section3/eda33q....
 Probability Sampling This site, created by author William M.K. Trochim, describes in detail five different types of random sampling. Some of these types include: simple random, stratified random, systematic random, cluster random, multi-stage sampling. The author provides examples, definitions, and the procedures behind the methods. Overall, this site provides a nice overview of probability sampling. http://www.socialresearchmethods.net/kb/sampprob.htm
 Learning Resources: Statistics: Non-Probability Sampling This is website, presented by Statistics Canada, examines the concept of non-probability sampling. It discusses types of non-probability sampling, differences between probability and non-probability sampling, and provides examples of non-probability sampling. Links to other topics related to sampling methods, bias, and exercise activities are also provided. http://www.statcan.gc.ca/edu/power-pouvoir/ch13/nonprob/5214...
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