How does T.V. or Radio know what their age group is?

Dude Son

New member
http://www.rbr.com/tv-cable/tv-cable_ratings/week-16-nbc-wins-in-adults-18-49.html

So the article states that NBC had alot of 18-49 watch their program. . . . So how did they know that? or do they?

How does broadcast stations know who is watching their programs? What data are they getting this information from.

How would they be able to tell someone between the age of 18-49 is watching a program, maybe it was a 65 year old?
I've worked for DHS and currently the army. Its not the government lol thats to complex. I study sociology and most statistics are based off complete BS. Seems like another BS statistics like the unemployment rate.
 
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