The data below represent the number of days absent, x, and the final grade, y, for a sample of college students at a large university. complete parts (a) through (e) below. no. of absences, x 0 1 2 3 4 5 6 7 8 9 final grade, y 88.5 85.7 82.8 80.3 77.4 73.1 63.6 68.1 65.2 62.4 (a) find the least-squares regression line treating the number of absences, x, as the explanatory variable and the final grade, y, as the response variable.