The average capacity usage for iPhone users has been

| June 14, 2018

The average capacity usage for iPhone users has been estimated as 400 megabytes per month. Assuming this finding to be based on a simple random sample of 80 iPhone users, with a sample standard deviation of megabytes per month, construct and interpret the 95% confidence interval for the population mean usage per month. Given this confidence interval, would it seem very unusual if another sample of this size were to have a mean of 350.0 megabytes per month?

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