
3. 
Statistics
can be powerful tools that help us understand our world. But statistics
must be used carefully, and people must understand what the data
do and do not tell us.
It is the
year 2000. You are running for reelection after two fiveyear
terms as mayor of a city of 800,000 people. In 1990, the population
was 600,000, and at that time 37 percent of the population in
the city had access to safe water. In the year 2000, 40 percent
of the population in the city now have access to safe water.



a. 
Did
the percentage of population with access to safe water and sanitation
increase or decrease during your time as mayor? By how much? 



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b. 
Calculate
the number of people with access to safe water in 1990. Calculate
the number of people with access to safe water in 2000. Did the
number of people with access to safe water increase or decrease
during your time as mayor. By how much? 



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c. 
Did
the number of people without access increase or decrease? (Find
the percentage of the population without access by subtracting the
percentage of the population with access from 100%, convert the
percentage into a decimal, and then follow the calculations you
used in question 2b.) By how much? 



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d. 
As
mayor, what can you say to voters about the progress you have made
in the area of safe water and sanitation? 



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e. 
What
might your challenger say to voters about the lack of progress you
have made? 



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f. 
What
can happen if statistics are not used carefully? 



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g. 
What
kinds of problems might make it difficult to provide safe water
to people in urban areas where populations are growing rapidly? 



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