| http://digfir-published.macmillanusa.com/hm_custom_osu/hmlsu_wischusen_f13_appendixe.html | Chapter 2. Descriptive Statistics
| 51e75cc7b62f8bd21500007e |
| http://digfir-published.macmillanusa.com/hm_custom_osu/hmlsu_wischusen_f13_appendixe_dlap.xml | DLAP questions | 51e75cc7b62f8bd21500007e |