Per capita expenditures for police protection for 20 cities are reported here for 2000 and 2010. Compute

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Per capita expenditures for police protection for 20 cities are reported here for 2000 and
2010. Compute a mean and standard deviation for each year and then describe the differences in expenditures for the five-year period.
Per capita expenditures for police protection for 20 cities are
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