Question
A transportation strategist wanted to compare the traffic congestion levels across four continents: Asia, Europe, North America, and South America. The file CongestionLevel contains congestion
A transportation strategist wanted to compare the traffic congestion levels across four continents: Asia, Europe, North America, and South America. The file CongestionLevel contains congestion level, defined as the increase (%) in overall travel time when compared to a free flow situation (an uncongested situation) for 10 cities in each continent.
a. Atthe0.05levelofsignificance, is there evidence of a difference in the mean congestion level across continents?
b. If the results in (a) indicate that it is appropriate to do so, use the Tukey-Kramer procedure to determine which continents differ in congestion level
c. What assumptions are necessary for (a)?
d. At the 0.05 level of significance, is there evidence of a difference in the variation of the congestion level across continents?
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