Concept explainers
PBS. In the old days, the Nielsen ratings of TV-watching habits would ask people to fill out a card indicating how much TV they watched and which shows they watched. Why did they get different results when they used electronic monitoring devices instead?
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The Heart of Mathematics: An Invitation to Effective Thinking, WileyPLUS NextGen Card with Loose-leaf Set Single Semester: An Invitation to Effective Thinking (Key Curriculum Press)
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