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Almost all U.S. light-rail systems use electric cars that run on tracks built at street level....

Almost all U.S. light-rail systems use electric cars that run on tracks built at street level. The Federal Transit Administration claims light-rail is one of the safest modes of travel, with an accident rate of .99 accidents per million passenger miles as compared to 2.29 for buses. The following data show the miles of track and the weekday ridership in thousands of passengers for six light-rail systems. City Miles of Track Ridership (1000s) Cleveland 15 13 Denver 17 33 Portland 38 79 Sacramento 21 29 San Diego 47 73 San Jose 31 28 St. Louis 34 40 Need 95% Confidence Interval and Prediction Interval.

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