Students Enrolled in an Introductory Statistics Course at a University $t$

Students enrolled in an introductory statistics course at a university were asked to take a survey that indicated whether the student's learning style was more visual or verbal. Each student received a numerical score ranging from -11 to +11 . Negative scores indicated a visual learner, and positive scores indicated a verbal learner. The closer the score was to -11 or +11 , the stronger the student's inclination toward that learning style. A score of 0 would indicate neutrality between visual or verbal learning. For the 39 students who took the survey, the mean score was -2.744 , and the standard deviation was 4.988 .
-Calculate the value of the $t$ -test statistic for the hypotheses stated in " State the null and alternative hypotheses for testing whether the mean score (among all students at this university) differs from 0" .