1. Brief presentation on data spread using sugar cube data
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

2. For normally distributed data:
wikipedia.org
For normally distributed data:
68% of the values are within 1 standard deviation of the mean 95% of the values are within two standard deviations 99.7% of the values are within 3 standard deviations.