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4.The Pew Internet and American Life Project reports that American adults send a mean of 20 text messages per day. A random sample of 60

4.The Pew Internet and American Life Project reports that American adults send a mean of 20 text messages per day. A random sample of 60 American adults showed a mean of 22 text messages per day. Assume that the population standard deviation is 20 text messages. Test using the level ofsignificance =0.01 whether the population mean number of text messages per day is greater than 20.

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