An advertising agency is judged by the increase in the proportion of people who buy a particular
Question:
(a) Find a 90% confidence interval for the difference in the proportion of people who prefer the stipulated product before and after the advertising campaign.
(b) Can you conclude that the advertising campaign has been successful in increasing the proportion of people who prefer the product? Use a level of significance of 0.10.
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Related Book For
Fundamentals of quality control and improvement
ISBN: 978-0470226537
3rd edition
Authors: amitava mitra
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