CCI 150 Lecture 9: CCI 150 Lecture 9

• School: UTK
• Department: Communication and Information
• Course: CCI 150
• Professor: Lisa Gary

Document Summary

Convenience: polling an audience that is easy to nd- convenient, man on the street, online polls you choose to complete, telephone polls you choose to complete, not representative. Sample size: hard to get truly random sample, more people included, the more accurate the results, bigger the sample size, the more accurate the results. Magic number: number of people you have to survey to be representative of any size population, magic number for 95% accuracy is 384 people. Tuesday, february 14, 2017: as sample size goes up, margin of error goes down. Lots of surveys, not all good: not all scienti c/probability, not all done well, before using results, evaluate: How many people were interviewed and how they were selected. How were the questions worded and in what order. Exit polls: happen with most major elections, try to predict the outcome, if done correctly, can be very accurate, very last question is usually how much money you make.