# 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?

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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