Basic Epidemiology (38 mins)
Scroll down to "Chapter 2: Measuring Health and Disease" and read the section titled "Age-standardized rates" on pages 29 to 30 and answer 'Study questions' 2.6, 2.8, and 2.9.
Click http://apps.who.int/iris/bitstream/handle/10665/43541/9241547073_eng.pdf link to open resource.