A sample of 40 CDs from a student's collection showed a mean length of 52.74 minutes with
Question:
(a) Construct a 95 percent confidence interval for the mean.
(b) Why might the normality assumption be an issue here?
(c) What sample size would be needed to estimate with 95 percent confidence and an error of ±3 minutes? (Data are from a project by statistics students Michael Evatz, Nancy Petack, and Jennifer Skladanowski.)
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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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