A random sample of 21 nickels measured with a very accurate micrometer showed a mean diameter of
Question:
(a) Why would nickel diameters vary?
(b) Construct a 99 percent confidence interval for the true mean diameter of a nickel.
(c) Discuss any assumptions that are needed.
(d) What sample size would ensure an error of ±0.0005 inch with 99 percent confidence? (Data are from a project by MBA student Bob Tindall.)
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Step by Step Answer:
a Because the diameter is continuous there will always be slight variation ...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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