9. A study was conducted looking at the relationship between the height (in inches) and weight (in pounds) of a random sample of 12 university male students. Ht, x 64.7 67.2 71.6 65 72 71.8 73 64.5 68.3 72.4 66.3 72.5 Wt, y 165 116 158 153 149 181 173 120 125 163 125 173 Note: x = 829.3 y = 1801 x 2 = 57440.57 y 2 = 276093 xy = 124990 a) What is the least squares regression line. b) Find the correlation coefficient. c) Determine whether there is a significant relationship between the height and weight of university male students. Test at the 5% level of significance.