To evaluate the effectiveness review sessions, a professor gave a pre-test before the review, and a post-test after. The results are shown in the table below. Pre-test (x1) 53 45 61 46 52 58 67 53 48 65 35 Post-test (₂) 60 47 60 58 50 56 54 51 45 69 34 Difference, ā = x2x1 Can we say that the review session significantly enhances test performance at 5 % significance level?

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