An investigator at a university wants to determine the typical weekly amount of time students work on part-time jobs. More particularly, they want to test if students on average work more than 15 hours per week. For a random sample of 39 students they report an average of 16.69 hours with a standard deviation of 7.61 hours. Do the data provide sufficient evidence that students at the university work on average more than 15 hours per week?