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Station Year 2009 Year 2010 Year 2011 Station A 4.75 5.12 3.97 Station B 4.97 4.17 4.57 Station C 4.13 4.14 4.18 Station D 5.08 4.38 4.8 Station E 4.66 4.5 4.85 Station F 4.32 4.34 4.31 Station G 4.11 3.95 5.19 Station H 3.76 4.36 4.52

a. Run descriptive statistics of the response-time data from the eight stations for the years 2009, 2010, and 2011 respectively.

b. For each of the years, what is the mean and standard deviation:

Year Mean (Std.Dev.)

2009 --- (---)

2010 --- (---)

2011 --- (---)

c. Interpret the standard deviation for 2011. What does this tell you?