A sample of 200 customers at a supermarket showed that 28 used a debit card to pay
Question:
(a) Find the 95 percent confidence interval for the population proportion.
(b) Why is it OK to assume normality in this case?
(c) What sample size would be needed to estimate the population proportion with 90 percent confidence and an error of ± .03?
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Step by Step Answer:
a b c Using z 1645 and E 03 the formu...View the full answer
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Related Book For 
Applied Statistics In Business And Economics
ISBN: 9780073521480
4th Edition
Authors: David Doane, Lori Seward
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