Brief presentation on data spread using sugar cube data. Also a demo of using Excel for data exploration.

sug-cub-data.xls has data

Show summary stats

Create scatter plot, manipulate plot

Draw red line for mean, dotted line for +/- 1 std dev

wikipedia.org

For normally distributed data:

68% of the values are within 1 standard deviation of the mean95% of the values are within two standard deviations99.7% of the values are within 3 standard deviations.