A poll of 2625 U.S. adults found that 1240 U.S. adults, or 47.238% regularly used Facebook as a news source. Find the margin of error and confidence interval for the percentage of U.S. adults who regularly use Facebook as a news source, at the 90% level of confidence. Express all answers as percentages rounded to 2 decimal places. Do not write the percent sign. Margin of Error (as a percentage): Confidence Interval: % to % Now find the margin of error and confidence interval for the percentage of U.S. adults who regularly use Facebook as a news source, at the 95% level of confidence. Margin of Error (as a percentage): Confidence Interval: % to % Finally, find the margin of error and confidence interval for the percentage of U.S. adults who regularly use Facebook as a news source, at the 99% level of confidence. Margin of Error (as a percentage): Confidence Interval: % to ___% The margin of error reflects the precision or accuracy of our estimate. Therefore, as the confidence level increases, the margin of error stays roughly the same decreases increases and the precision of our estimate decreases increases stays roughly the same NOTE: A wide confidence interval is not as precise as a narrow confidence interval. Therefore a smaller margin of error gives a more precise interval estimate, while a larger margin of error gives a wider interval and is not as precise.

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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Question

A poll of 2625 U.S. adults found that 1240 U.S. adults, or 47.238% regularly used Facebook as a news source.

Find the margin of error and confidence interval for the percentage of U.S. adults who regularly use Facebook as a news source, at the 90% level of confidence. Express all answers as percentages rounded to 2 decimal places. Do not write the percent sign.

Margin of Error (as a percentage): __
Confidence Interval:__ % to__ %

Now find the margin of error and confidence interval for the percentage of U.S. adults who regularly use Facebook as a news source, at the 95% level of confidence.

Margin of Error (as a percentage): __
Confidence Interval:__ % to__ %

Finally, find the margin of error and confidence interval for the percentage of U.S. adults who regularly use Facebook as a news source, at the 99% level of confidence.

Margin of Error (as a percentage): __
Confidence Interval: __% to ___%

The margin of error reflects the precision or accuracy of our estimate. Therefore, as the confidence level increases, the margin of error

stays roughly the same
decreases
increases

and the precision of our estimate

decreases
increases
stays roughly the same

NOTE: A wide confidence interval is not as precise as a narrow confidence interval. Therefore a smaller margin of error gives a more precise interval estimate, while a larger margin of error gives a wider interval and is not as precise.

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