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A sample of 40 CDs from a student's collection showed a mean length of 52.74 minutes with a standard deviation of 13.21
Posted: Thu May 05, 2022 9:11 pm
by answerhappygod
- A Sample Of 40 Cds From A Student S Collection Showed A Mean Length Of 52 74 Minutes With A Standard Deviation Of 13 21 1 (33.03 KiB) Viewed 39 times
A sample of 40 CDs from a student's collection showed a mean length of 52.74 minutes with a standard deviation of 13.21 minutes. (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 u with 95 percent confidence and an error of 63 minutes? (Data are from a project by statistics students Michael Evatz, Nancy Petack, and Jennifer Skladanowski.)