To assess the effectiveness of a new workplace safety awareness program, five employees at Potemkin Realty were randomly chosen. Before they participate in the awareness program, the five workers are given a test consisting of 100 safety related questions. After participating in the program, the same five workers are tested again. The table below shows before and after test results. Treating each worker as a matched pair of subjects, and assuming that the necessary population conditions are satisfied, build a 95% confidence interval estimate of the average difference in test scores for the populations represented.

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Test Results Worker 2 345 Before 45 36 52 58 63 After 6 59 7 75