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A report from Texas Transportation Institute ( Texas A& M University System 2005) on congestion reduction strategies included data on the extra travel time during rush hour for different urban areas. The following are the data for urban areas that had a population of over 3 million.
a. Compute the mean and standard deviation for this data set.
b. Delete the observation for Los Angeles and recompute the mean and standard deviation. Compare this mean and standard deviation to the values computed in Part (a). What does this suggest about using the mean and standard deviation as measures of center and spread for a data set with outliers? |
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