2. Chapter 1 Introduction

3. Examples Many election year polls http://www.realclearpolitics.com/epolls/2012/president/u s/general_election_romney_vs_obama-1171.html

4. Examples  Surveys about the US:  American Community Survey http://www.census.gov/acs/www/  Consumer Price Index http://www.bls.gov/cpi/home.htm  Unemployment Rate (political hot potato!) http://www.bls.gov/cps/  Billion Prices Project MIT (sampling?) http://bpp.mit.edu/usa/  Nielsen TV Ratings http://www.nielsen.com/us/en/top10s.html How does Nielsen work?

5. DVRs Shift Viewing Habits, and Ratings by Gary Levin, USA TODAY June 11, 2014 The increasing usage of digital video recorders, which easily allow viewers to postpone watching their favorite shows, has vastly complicated the math of TV ratings, new Nielsen data show. And it explains how ABC's Modern Family ultimately eclipsed Fox's American Idol among key young-adult audiences.ABC Among viewers ages 18 to 49, the comedy jumped 48% when factoring in delayed viewing, while Idol's performance show gained just 17%. But viewers rarely delay reality shows, news, awards telecasts and sports programming by more than a day. Sitcoms and dramas are most prone to procrastination, accounting for 29 of the top 30 gainers. "DVRs continue to play a more important role" in overall viewing, says ABC research chief Charles Kennedy … “What's suffering at the hands of the DVR is old-fashioned channel surfing.”Charles Kennedy

6. Top shows of a recent season 1.Sunday Night Football NBC 20.7 2. American Idol (Wed.) Fox 20.1 3. NCIS CBS 19.7 4. American Idol (Thu.)Fox 18.5 5. Dancing With the Stars ABC 18.3 6. NCIS: Los Angeles CBS 16.3 7. Dancing With the Stars Results ABC 16.2 8. The Big Bang Theory CBS 15.9 * The Voice NBC 15.9 10. The Mentalist CBS 14.8 Nielsen Ratings (name, network, avg. weekly viewers) Top shows of a recent season (18-49) 1.Sunday Night Football NBC 10.2 2. American Idol (Wed.) Fox 8 3. The Voice NBC 7.9 4. Modern Family ABC 7.4 5. The Big Bang Theory CBS 7.1 * American Idol (Thu.)Fox 7.1 7. Two and a Half Men CBS 6.6 8. 2 Broke Girls CBS 5.6 * The X Factor (Wed.) Fox 5.6 10. Grey’s Anatomy ABC 5.5

7. Ratings Are IMPORTANT! http://money.cnn.com/2013/01/03/news/companies/cbs-super- bowl/index.html

8. How do we obtain data for surveys such as those above? Would you fill out a survey that …  Would take 2 hours of your time?  has 30 essay questions?  asked about your favorite yogurt?  asked if the college football playoff should be expanded to 8 teams?

9. Would you be comfortable telling a researcher about …  your finances?  your participation in illegal activities?  personal medical information?  whether you have cheated on an exam during the current academic year?

10. To be useful, a sample should be representative, meaning that characteristics of interest in the population can be estimated from the sample with a known degree of accuracy. http://abcnews.go.com/blogs/politics/polls/

11. In the next chapter we will learn the basic terms and ideas associated with sampling.

12. End of Chapter 1