Youth survey According to a recent Gallup survey, 93%of teens use the Internet, but there are differences in howteen boys and girls say they use computers. The telephonepoll found that 77% of boys had played computer gamesin the past week, compared with 65% of girls. On theother hand, 76% of girls said they had e-mailed friends inthe past week, compared with only 65% of boys.a) For boys, the cited percentages are 77% playingcomputer games and 65% using e-mail. That total is142%, so there is obviously a mistake in the report.No? Explain.b) Based on these results, do you think playing gamesand using e-mail are mutually exclusive? Explain.c) Do you think whether a child e-mails friends isindependent of being a boy or a girl? Explain.d) Suppose that in fact 93% of the teens in your areado use the Internet. You want to interview a few whodo not, so you start contacting teenagers at random.What is the probability that it takes you 5 interviewsuntil you find the first person who does not use theInternet?
Youth survey According to a recent Gallup survey, 93%
of teens use the Internet, but there are differences in how
teen boys and girls say they use computers. The telephone
poll found that 77% of boys had played computer games
in the past week, compared with 65% of girls. On the
other hand, 76% of girls said they had e-mailed friends in
the past week, compared with only 65% of boys.
a) For boys, the cited percentages are 77% playing
computer games and 65% using e-mail. That total is
142%, so there is obviously a mistake in the report.
No? Explain.
b) Based on these results, do you think playing games
and using e-mail are mutually exclusive? Explain.
c) Do you think whether a child e-mails friends is
independent of being a boy or a girl? Explain.
d) Suppose that in fact 93% of the teens in your area
do use the Internet. You want to interview a few who
do not, so you start contacting teenagers at random.
What is the probability that it takes you 5 interviews
until you find the first person who does not use the
Internet?
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