A researcher conducts a study to determine which terrorist organization—Hamas, Hezbollah, or Al Qaeda—poses the greatest threat to innocent civilians. The researcher examines 15 randomly selected bombing attacks committed by these organizations and calculates the number of casualties per attack. Using the following casualty data, test the null hypothesis that none of these terrorist groups is more threatening than the rest.

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Hamas 62378 Hezbollah 9 10 14 11 9 Al Qaeda 9 15 16 12 18