A school board study found a moderately strong negative association between the number of hours high school seniors worked at part-time jobs after school hours and the students' grade point averages. Explain in this context what "negative association" means. When the number of hours students worked increase, the GPA tends to decrease When the number of hours students worked increase, the GPA tends to increase When the number of students that have part time jobs increase, the GPA increases When the number of hours students worked decrease, the GPA tends to decrease