A sample of used cars on a lot was taken, and the age of each car was recorded The following MINITAB output presents a confidence interval for the population mean age a How many degrees of freedom are there b If the population were not approximately normal, would this confidence interval be valid E...

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A sample of used cars on a lot was taken, and the age of each car was

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A sample of used cars on a lot was taken, and the age of each car was recorded. The following MINITAB output presents a confidence interval for the population mean age. image text in transcribed

a. How many degrees of freedom are there?

b. If the population were not approximately normal, would this confidence interval be valid? Explain.

c. Find the critical value tα∕2 for a 98% confidence interval.

d. Use the critical value and the information in the output to construct a 98% confidence interval.

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Elementary Statistics

ISBN: 9781259969454

3rd Edition

Authors: William Navidi, Barry Monk

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Question Posted: May 07, 2024 04:01 AM

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A sample of used cars on a lot was taken, and the age of each car was

Question:

Variable N Mean StDev SE Mean X 15 5.9373 2.0387 95% CI 0.5264 (4.8083, 7.0663)

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Elementary Statistics

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