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If we want to construct a 95% confidence interval for the average battery life for smartphone c users that extends at most 2 hours on each side of the mean, how many users do we need to survey?
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If we want to construct a 95% confidence interval for the average battery life for smartphone c users that extends at most 2 hours on each side of the mean, how many users do we need to survey?

User Jeff Vanzella
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If we want to construct a 95% confidence level for the average battery life for smartphone c users that extends at most 2 hours on each of the means, we need to survey at most 706 users among 1000 total users. 
User Axxxon
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