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The Pew Internet and American Life Project reports that young people ages 12-17 send a mean...

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Basic Math

The Pew Internet and American Life Project reports that youngpeople ages 12-17 send a mean of 60 text messages per day. A randomsample of 40 young people showed a sample mean of 69 texts per day.Assume ? = 28 for the population.

Using a significance level of ? = 0.05, test whether thepopulation mean number of text messages per day is greater than60.

i. What is the null hypothesis?
ii. What is the alternative hypothesis?

iii. Which kind of test is this (left-tail, right-tail, ortwo-tail)? iv. Find zdata.

v. Find the critical region.
vi. Do we reject the null hypothesis or fail to reject it?

Answer & Explanation Solved by verified expert
3.6 Ratings (526 Votes)
Solution Given thatPopulation mean 60Sample mean 69Population standard deviation    See Answer
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