A transportation strategist wanted to compare the traffic congestion levels acro

A transportation strategist wanted to compare the traffic congestion levels across three continents; Asia, Europe and North America. The file congestionlevel contains congestion level defined as the increase (%) in overall travel time when compared to a free flow situation for 30 cities in each continent. 
a) At 0.05 level of significance is there evidence of difference in the median congestion levels across continents?  

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