Alta Vista University is trying to evaluate the effectiveness of its new freshman writing class. Each student in the class has submitted a preclass writing sample and a postclass writing sample scored by an English professor with no knowledge of which sample is preclass and which is postclass, and which student's writing sample is being scored. The student scores are given in the table.

Treating each student as a matched pair of subjects, and assuming that the necessary population conditions are satisfied, construct a hypothesis test to test a null hypothesis that the difference in average scores for the populations represented is 0. Use a significance level of .10.

Scores Student 3 4 Post-class 78 85 63 98368 Pre-class 73 87 56 73 66