=+factors that affect whether students stay in college. The following summary statistics are based on data from a sample of 44 students who did not return to college after the first quarter (the nonpersisters) and a sample of 257 students who did return (the persisters):

Number of Hours Worked per Week During the First Quarter Standard Mean Deviation Nonpersisters 25.62 14.41 Persisters 18.10 15.31