A study of concrete porosity ( y ) with respect to * = unit weight in concrete specimens yielded the following figures: n = 19, > xi = 1,643.1, yi = 299.39, a = 179,853.09, Ci yi = 32,315.63, >y= = 6,450.8. If the equation of the least squares regression line is y = a + bx, then find and enter the value of b rounded to three decimal places in the space provided. (Find your answer to 3 decimal places.)