A statistics teacher was interested in the relationship between the number of days students waited to start a project and the score that project received (out of 100 points). Information was collected on several students and was used to obtain the regression equation widehat y is equal to negative 3 point 6 4 x plus 96 point 5 , where x represents the number of procrastination days and widehat y is the predicted grade. Which statement best describes the meaning of the y - intercept of the regression line?