A group of 20 college students participated in a study to examine the effects of a new study technique on their exam performance. Each student's exam score before and after implementing the new study technique was recorded. The average difference between the exam scores before and after implementing the new study technique was found to be 7 points higher after the technique was applied. The variance of the differences for the entire sample was calculated to be 36. Is there a significant difference in the exam scores before and after implementing the technique? Use a two-tailed test at alpha.05.

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