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2.11 Incomes of college grads. The Census Bureau reports that the mean
and median income of people who worked full-time in 2001 and had at
least a bachelor's degree were $53,054 and $72,674. Which of these
numbers is the mean and which is the median? Explain your reasoning.
2.12 Internet access. How much do users pay for Internet access? Here are
the rhonthly fees (in dollars) paid by a random sample of 50 users of
commercial Internet service providers in August 2000:4
20 40 22 22 21 21 20 10 20 20
20 13 18 50 20 18 15 8 22 25
22 10 20 22 22 21 15 23 30 12
9 20 40 22 29 19 15 20 20 20
20 15 19 21 14 22 21 35 20 22
(a) Make a stemplot of these data. Briefly describe the pattern you see.
About how much do you think America Online and its larger
competitors were charging in August 2000? Are there any outliers?
(b) To report a quick summary of how much people pay for Internet
service, do you prefer ands or the five-number summary? Why?
Calculate your preferred summary
