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ericlei12 ericlei12
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3 weeks ago
The average battery life of the iPhone 4S is reported to be 6.0 hours by Apple. Assume that the standard deviation for the battery life for this cell phone is 30 minutes. A random sample of 50 iPhones had an average battery life of 5.7 hours. Use a 90% confidence interval to test the validity of Apple's claim.
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Business Statistics


Edition: 2nd
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Natalie P.Natalie Price
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Because this confidence interval does not contain 6.0 hours, Apple's claim is not validated by this sample.

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Good timing, thanks!
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Correct Slight Smile TY
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Thanks for your help!!
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