Question

Surveys conducted for the Pew Internet & American Life Project suggest that communication patterns vary across three groups of teenagers: social networkers, content creators, and "multi-channel teens" (teens who use the Internet to send instant messages and participate in social networks, and who use their mobile phones to send text messages) In one survey, Internet-using teenagers were asked how often they send text messages to friends. Their responses are summarised in the following (incomplete) cross-classification table. Separate tabulations are provided for social networkers (teens who have a profile on a social network site such as Facebook or MySpace) and for teens who are not social networkers. Fill in the empty cells on the cross-classification table below. Texts Every Day Does Not Text Every Day Total 493 Social networker Not a social networker 310 Total 886 Let S the event that the Internet-using teen is a social networker N the event that the Internet-using teen is not a social networker Tthe event that the Internet-using teen sends text messages to friends every day o the event that the Internet-using teen does not send text messages to friends every day Consider the following random experiment: An Internet-using teenager is randomly selected and surveyed. The teen is then friends every day or someone who does not. categorised as a social networker or not a social networker, and as someone who sends text messages to

Answer 1

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