(Solution Download) A survey showed that 8% of Internet users age 18 and older report keeping a blog


A survey showed that 8% of Internet users age 18 and older report keeping a blog. Referring

 

to the 18?29 age group as young adults, the survey showed that for bloggers 54% are

 

young adults and for nonbloggers 24% are young adults (Pew Internet & American Life

 

Project, July 19, 2006).

 

a. Develop a joint probability table for these data with two rows (bloggers vs. non-bloggers)

 

and two columns (young adults vs. older adults).

 

b. What is the probability that an Internet user is a young adult?

 

c. What is the probability that an Internet user keeps a blog and is a young adult?

 

d. Suppose that in a follow-up phone survey we contact someone who is 24 years old.

 

What is the probability that this person keeps a blog?

 







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