An advertising executive wants to estimate the mean weekly amount of time consumers spend watching traditional television
Question:
An advertising executive wants to estimate the mean weekly amount of time consumers spend watching traditional television daily. Based on previous studies, the standard deviation is assumed to be 20 minutes. The executive wants to estimate, with 99% confidence, the mean weekly amount of time to within ± 5 minutes.
a. What sample size is needed?
b. If 95% confidence is desired, how many consumers need to be selected?
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Related Book For 
Business Statistics A First Course
ISBN: 9780321979018
7th Edition
Authors: David M. Levine, Kathryn A. Szabat, David F. Stephan
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