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Some links are repeated for use with more than one lesson.

7.1  Measures of Central Tendency

http://www.regentsprep.org/regents/math/mean/measure.htm
This page explains the measures of central tendency and has examples.

http://www.regentsprep.org/regents/math/mean/Pmeasure.htm
This page contains word problems that are practice with the measures of central tendency.

7.2  Frequency Distributions

http://infinity.cos.edu/faculty/woodbury/Stats/Tutorial/Data_Freq.htm
This site explains frequency distribution and has an example of how to set it up.

7.3  Scatter Plots, Correlation, and Lines of Best Fit

http://www.regentsprep.org/Regents/Math/data/scatter.htm
This page contains notes and a graph explains scatter plots.

http://argyll.epsb.ca/jreed/math9/strand4/scatterPlot.htm
This site defines scatter plots and lines of best fit and has a graph to plot points on.

7.4  Stem-and-Leaf Plots

http://www.mathsisfun.com/definitions/stem-and-leaf-plot.html
This site contains a quick guide to using a stem-and-leaf plot.

http://www.regentsprep.org/regents/math/data/stemleaf.htm
This page has an explanation of stem-and-leaf plots with examples of how to construct them and an explanation of the special case ones.

7.5  Quartiles and Box-and-Whisker Plots

http://www.purplemath.com/modules/boxwhisk.htm
This site explains quartiles and box-and-whisker plots through text and graphs.

http://regentsprep.org/regents/Math/data/boxwhisk.htm
This page explains box-and-whisker plots and their quartiles and the special case.

7.6  Measures of Dispersion

http://www.statistics.com/resources/glossary/d/dispersion.php
This page contains notes explaining measures of dispersion.