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The data below represent commute times​ (in minutes) and scores on a​ well-being survey. Complete parts​ (a) through​ (d) below. Commute Time​ (minutes), x 5 20 30 35 60 84 105 ​Well-Being Index​ Score, y 69.3 68.1 67.3 67.2 66.0 65.6 64.0 a) Find the​ least-squares regression line treating the commute​ time, x, as the explanatory variable and the index​ score, y, as the response variable.