Nielsen media research collects national tv ratings by using a "people meter." this is a box that is attached to tv sets, vcrs, dvrs, cable boxes, and satellite dishes in over 9,000 households across the country. a viewer uses the remote to signal the people meter that he or she is watching a tv program. the box then transmits the viewing information to the nielsen company. the information nielsen is collecting is referred to as

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Answer: Audience measurement

The audience measurement is the number of people that are in an audience. It can refer to TV and radio, but also mediums like magazines and newspapers.

The Nielsen ratings, operated by Nielsen Media Research were an important development in this area of study.