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In this activity, the student will calculate Pearson's Chi-Square statistics based on a given contingency table. The following table shows a cohort study on exposure to tomatoes and Salmonella infection. Please calculate chi-square statistics? Salmonella? Yes No Total Tomatoes 30 100 130 No Tomatoes 20 150 170 Total 50 250 300 Expected values: Yes No Total Tomatoes 130 No Tomatoes 170 Total 50 250 300 Chi-square: Yes No Total 130 Tomatoes 170 No Tomatoes 50 250 300 Total The chi-square (x2) for this example is