Essentials Of Statistics
Essentials Of Statistics
4th Edition
ISBN: 9781305093836
Author: HEALEY, Joseph F.
Publisher: Cengage Learning,
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Textbook Question
Chapter 4, Problem 4.12P

a. P A Compute the range, interquartile range, and standard deviation for the data presented in problem 3.4. The data are reproduced here. (NOTE: To simplify computations for Q , round off the case numbers that mark the first and third quartiles to the nearest whole number.)

b. What would happen to the value of the standard deviation if you removed Chicago (the city with the highest score) from this distribution and recalculated? Why?

City Annual Person – Hours Lost to Traffic Congestion
Baltimore 33
Boston 28
Buffalo 11
Chicago 44
Cleveland 13
Dallas 32
Detroit 23
Houston 37
Kansas City 14
Los Angeles 40
Miami 26
Minneapolis 27
New Orleans 20
New York 24
Philadelphia 26
Phoenix 23
Pittsburgh 23
San Antonio 19
San Diego 23
San Francisco 30
Seattle 27
Washington, D.C. 41

Source: U.S. Bureau of the Census. 2012. Statistical Abstract of the United States: 2012. Table 1099. Available at http://www.census.gov/prod/2011pubs/12statab/trans.pdf

3.4 P A The following table presents the annual person hours of time lost due to traffic congestion for a group of cities for 2009. This statistic is a measure of traffic congestion.

City Annual Person – Hours Lost to Traffic Congestion
Baltimore 33
Boston 28
Buffalo 11
Chicago 44
Cleveland 13
Dallas 32
Detroit 23
Houston 37
Kansas City 14
Los Angeles 40
Miami 26
Minneapolis 27
New Orleans 20
New York 24
Philadelphia 26
Phoenix 23
Pittsburgh 23
San Antonio 19
San Diego 23
San Francisco 30
Seattle 27
Washington, D.C. 41
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