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A study of a local high school tried to determine the mean number of text messages that each student sent per day. The study

A study of a local high school tried to determine the mean number of text messages that each student sent per day. The study surveyed a random sample of 36 students in the high school and found a mean of 156 messages sent per day with a standard deviation of 61 messages. Determine a 95% confidence interval for the mean.

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