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For the question: In a group of 100 randomly selected iPhone users in the US in 2010, 30 users indicated that their iPhone failed within 2 years of...
For the question:
In a group of 100 randomly selected iPhone users in the US in 2010, 30 users indicated that their iPhone failed within 2 years of purchasing the item. A 95% confidence interval for the failure rate for all iPhones in the US in 2010 is (4 d.p.)
