A random sample of nine students was selected to test for the effectiveness of a special course designed to improve memory. The following table give the results of a memory test given to these students before and after this course. Before 43 57 48 65 81 49 38 69 58 After 49 56 55 77 89 57 36 64 69 Construct a 95% confidence interval for the mean Ha of the population paired differences, where a paired is defined as the difference between the memory test scores of a student before and after attending this course.

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