The manufacturer of a certain type of new phone battery claims that the average lifespan of the batteries is 500 charges; that is, the battery can be charged at least 500 times before failing. To investigate the claim, a consumer group will select a random sample of cell phones with the new battery and use the phones through 500 charges of the battery. The proportion of batteries that fail to last through 500 charges will be recorded. The results will be used to construct a 95 percent confidence interval tl estimate the proportion of all such batteries that fail to last through 500 charges

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beware of counterfeit parts

some counterfeit and third party power adapters and batteries may not be designed properly and could result in safety issues. to ensure you receive a genuine apple battery during a battery replacement, we recommend visiting an apple store or apple authorized service provider. if you need a replacement adapter to charge your apple device, we recommend getting an apple power adapter.

also non-genuine replacement displays may have compromised visual quality and may fail to work correctly. apple-certified screen repairs are performed by trusted experts who use genuine apple parts.

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