Question

According to the Pew Internet & American Life Project, 73% of U. S. teens aged 12– 17 used social networks. A random sample of 130 teenagers from this age group was selected.
a. Calculate the standard error of the proportion.
b. What is the probability that less than 75% of the teens from this sample used social networks?
c. What is the probability that between 70% and 80% of the teens from this sample used social networks?
d. What impact would changing the sample size to 200 teens have on the results of parts a, b, and c?


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  • CreatedJuly 17, 2015
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