Paul Sabatier, a human relations theorist working for Warm and Fuzzy, Inc., believes that workers who work in cooperatives are more satisfied than workers who do not. He surveys 50 cab drivers who work in cooperatives and 30 cab drivers who do not work in cooperatives. All are asked whether they are satisfied with their job. From the data in the accompanying table, calculate the percentage difference, gamma, lambda, and chi-square. What do you conclude?

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Job Satisfaction Not satisfied Satisfied Type of Organization Noncooperative 13 17 Cooperative 29 21