68. iPod reliability. MacInTouch reported that several versions of the iPod reported failure rates of 20% or

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68. iPod reliability. MacInTouch reported that several versions of the iPod reported failure rates of 20% or more.

From a customer survey, the color iPod, first released in 2004, showed 64 failures out of 517. Is there any evidence that the failure rate for this model may be lower than the 20% rate of previous models?

a) Find the z-score of the observed proportion.

b) Compare the z-score to the critical value for a 0.1%

significance level using a one-sided alternative.

c) Explain your conclusion.

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Business Statistics

ISBN: 9780321716095

2nd Edition

Authors: Norean D. Sharpe, Paul F. Velleman, David Bock, Norean Radke Sharpe

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Question Posted: Sep 07, 2024 03:04 AM

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68. iPod reliability. MacInTouch reported that several versions of the iPod reported failure rates of 20% or

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Business Statistics

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