Please help me revise my answer...I couldn't find any ways on how to answer this question...I already have my answer on question number 5 but my teacher, she said it needs revision and I don't know how..please help me solve this. It's about STATISTICAL INFERENCE FOR TWO SAMPLES

This is my answer on question number 5:

5. Is there a difference between the Second Grading performance in English and Math of pupils from Estrella Village Elementary School? (Hint: Use actual grades in English Math for the paired comparison) Female MATH ENGLISH D DZ Pupils 1 85 85 83 32 79 79 0 4 79 79 0 0 5 86 86 6 85 86 -1 84 BA 83 1 9 83 31 10 81 80 1 11 81 30 SUM 910 905 5 MEAN 82.72727 82.2727273 0.500 1. H: D=0 2. Hi: D=0 (two-tailed) 3. 0 = 0.05 4. Test Statistic: T with n- 1 = 10 degrees of freedom Critical value for T at 0.05 level (two-tailed) and v=10 dfare -2.228 and +2.228 5. Computations: = 9 - 1/11 (5) + 11-1 = 6.7272 + 10 = 0.8201 = 0.0454 + 0.8202 square root of 11 = 0.454 = 0.2473 = 1.836 Conclusion: Accept the null hypothesis. There is no significant difference between the Second Grading performance in English and Math of pupils from Estrella Village Elementary School.Data: Performance of Grade VI pupils in two elementary schools in Mama North District (Cervantes, 2007) RESP GRADING SCHOOL SEX MATH ENGLISH AVERAGE 20 90 90_0 85 86.0 81 81.0 78 79_0 79 77 78.0 77 76 76.5 87 88.0 86 36.5 85 85.5 84 84.5 83 83.5 82 82.5 81 81.5 80.5 80.0 78 79_0 76 76.0 85 34.5 82 81.0 79 79_0 79 78.5 85 85.0 84 84.0 83 83_0 83 82.5 83 82.0 81 80.5 80 30_0 91 91.5 28 89_0 35 85.0 81 81.5 79 79_0 79 79_0 78 78.0 91 90 5 88.5 87 88.0 84 34.0 84 83.5 82 82.0 81 81.5 80 80.5 79 79 5 77 77.5 85 85.0 19 82.520 79 79 79_0 21 79 79 79_0 22 36 86.0 86 85.5 24 84 84.0 25 83.5 26 81 82.0 27 80 80.5 28 80 80.5 Coding: SCHOOL: 1 -Bagong Sicat E.S.; 2 -Estrella Village E.S. // SEX: 1 -boy; 2-girl