What advertising medium is most influential in making a purchase decision? According to a TVB survey, 37.2%
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a. To conduct a follow up study that would provide 95% confidence that the point estimate is correct to within ±0.04 of the population proportion, how large a sample size is required?
b. To conduct a follow up study that would provide 99% confidence that the point estimate is correct to within ±0.04 of the population proportion, how many people need to be sampled?
c. To conduct a follow up study that would provide 95% confidence that the point estimate is correct to within ±0.02 of the population proportion, how large a sample size is required?
d. To conduct a follow up study that would provide 99% confidence that the point estimate is correct to within ±0.02 of the population proportion, how many people need to be sampled?
e. Discuss the effects on sample size requirements of changing the desired confidence level and the acceptable sampling error.
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Related Book For
Statistics For Managers Using Microsoft Excel
ISBN: 772
7th Edition
Authors: David M. Levine, David F. Stephan, Kathryn A. Szabat
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