Question a survey showed that 8 of internet users age 18, Ask an Expert

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Question: A survey showed that 8% of Internet users age 18 and older report keeping a blog. Refer-ring to the 18-29 age group as young adults, the survey showed that for bloggers 54% are young adults and for non bloggers 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 tint 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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