4. Suppose your group would like to do a research about the satisfaction with school service, and you believe that our school service will be higher than the national wide school service. The national wide service is measured on 10 scale, and the overall mean is 6.4. Our school service is measured on 5 scales, and the overall mean is 4, the sample standard deviation is 1.4, and the participation includes 196 students. Does the overall satisfaction of school service is higher than the overall satisfaction of national wide?
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