It is common for public opinion polls to have a confidence level of 95%, meaning that there

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It is common for public opinion polls to have a “confidence level” of 95%, meaning that there is a 0.95 probability that the poll results are accurate within the claimed margins of error. If each of the following organizations conducts an independent poll, find the probability that all of them are accurate within the claimed margins of error: Gallup, Roper, Yankelovich, Harris, CNN, ABC, CBS, NBC, New York Times. Does the result suggest that with a confidence level of 95%, we can expect that almost all polls will be within the claimed margin of error?

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Elementary Statistics

ISBN: 9780321500243

11th Edition

Authors: Mario F. Triola

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