A random sample of 100 high school students was asked, "Do you prefer to be a leader or a follower?" The responses were then classified according to grade level. Here is a bar graph of the results: Frequency 30 25 20 15 10 5 0 6 12 9th Grade and Leadership Preference 4 18 10th 7 25 11th Grade Level 12 16 12th Leader Follower Based on this sample, is there convincing evidence of an association between grade level and leadership preference in the population of students at this large high school? Use a = 0.05. Provide statistical evidence to support your answer.

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