An advertising executive wants to estimate the mean amount of time that consumers spend with digital media

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An advertising executive wants to estimate the mean amount of time that consumers spend with digital media daily. From past studies, the standard deviation is estimated as 45 minutes.

a. What sample size is needed if the executive wants to be 90% confident of being correct to within ± 5 minutes?

b. If 99% confidence is desired, how many consumers need to be selected?

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Business Statistics A First Course

ISBN: 9780321979018

7th Edition

Authors: David M. Levine, Kathryn A. Szabat, David F. Stephan

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Question Posted: Jul 16, 2015 07:30 PM

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An advertising executive wants to estimate the mean amount of time that consumers spend with digital media

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