The following tables provides before and after performance results on a history quiz. In between, a history lesson was given. What is the upper limit of the 95% confidence interval for the difference in scores (after lesson minus before lesson scores)? Round your answer to one decimal place. Before Lesson Quiz Results 6 7 6 14 9 6 6 7 7 9 After Lesson Quiz Results 13 7 10 10 9 10 19 19 17 14

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