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In 2010 the Pew Research Center reported that teenagers send on average 50 text messages
every day. A researcher suspects this number is out of date, and wishes to determine if teens are
sending fewer texts than they used to. A random sample of 25 teens were found to be sending an
average of 47.75 texts per day, with a standard deviation of 15. Testing at 10% significance and
stating the null and alternative hypothesis, what can the researcher conclude?

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  • 1. In 2010 the Pew Research Center reported that teenagers send on average 50 text messages every day. A researcher suspects this number is out of date, and wishes to determine if teens are sending fewer texts than they used to. A random sample of 25 teens were found to be sending an average of 47.75 texts per day, with a standard deviation of 15. Testing at 10% significance and stating the null and alternative hypothesis, what can the researcher conclude?