A sample of 9 customers in the quick lane in a supermarket showed a mean purchase of
Question:
(a) Find the 95 percent confidence interval for the true mean.
(b) Why should you use t instead of z in this case?
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a b Use t instead ...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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