In a survey, two independent simple random samples were taken to compare the proportion of students who participate in extracurricular activities between two schools. From Sample A (School X), 500 students were surveyed, and 320 of them participate in extracurricular activities. From Sample B (School Y), 600 students were surveyed, and 420 of them participate in extracurricular activities. What is the difference in sample proportions of students who participate in extracurricular activities between School X and School Y?

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