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A random sample of n=755 us cell phone users 18 and older in may 2011 found...

A random sample of n=755 us cell phone users 18 and older in may 2011 found that the average number of text messages sent and received per day is 41.5 messages, with standard error about 6.1

Find a 95% confidence interval for the mean number of text messages.

The 95% confidence interval is what to what?

Math   Statistics-And-Probability   
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