In a study of investment behavior, a sample of 1500 investors was selected and asked to categorize their investment behavior as “aggressive,” “balanced,” or “conservative.” Investors were also categorized by income. Results from the study appear in the contingency table below:

Use a chi square test of independence to test a null hypothesis that investment behavior is independent of income for the population represented here. Use a significance level of 5% for your test.

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Investment Behavior 100 100-250 >250 Totals Income ($000) Agress BaCs Totals 150 160 90400 250 330 220 800 100 110 90 300 500 600 400 500