For the following exercises, use the traditional method of hypothesis testing unless otherwise specified.

The grade point average of a group of students was recorded for one month. During the next nine-week grading period, the students attended a workshop on study skills. Their GPAs were recorded at the end of the grading period, and the data are shown. Using the Wilcoxon signed-rank test at α = 0.05, can it be concluded that the GPA increased?

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Before 3.0 2.9 2.7 2.5 2.1 2.6 1.9 2.0 After 3.2 3.4 2.9 2.5 3.0 3.1 2.4 2.8