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MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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4 4. Newspaper Surveys Although newspapers frequently report survey results, they typically do not use confidence intervals. Instead, they will report the population mean with a plus/minus amount of error (e.g. 25% + 2%). For the following survey information, convert the "plus/minus" language into a confidence interval, and then, using the "Confidence Intervals for Population Proportion" spreadsheet, approximate the value of the level of confidence, c, for each situation. a. In a survey of 8451 U.S. adults, 31.4% said they were taking vitamin E as a supplement. The survey's margin of error is plus or minus 1%. b. In a survey of 1001 U.S. adults, 27% said they had smoked a cigarette in the past week. The survey's margin of error is plus or minus 3%.
Transcribed Image Text:4 4. Newspaper Surveys Although newspapers frequently report survey results, they typically do not use confidence intervals. Instead, they will report the population mean with a plus/minus amount of error (e.g. 25% + 2%). For the following survey information, convert the "plus/minus" language into a confidence interval, and then, using the "Confidence Intervals for Population Proportion" spreadsheet, approximate the value of the level of confidence, c, for each situation. a. In a survey of 8451 U.S. adults, 31.4% said they were taking vitamin E as a supplement. The survey's margin of error is plus or minus 1%. b. In a survey of 1001 U.S. adults, 27% said they had smoked a cigarette in the past week. The survey's margin of error is plus or minus 3%.
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