Suppose that 600 thirty-year-olds were surveyed to determine whether or not there is a relationship between the level of education an individual has and salary. Conduct a test of independence.

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Annual Salary < $30,000 15 $30,000-$40,000 20 Not a high school graduate High school graduate College Masters or graduate doctorate 25 10 5 40 70 30 $40,000-$50,000 10 20 40 55 $50,000-$60,000 5 10 20 60 $60,000+ 0 5 10 150