able 4 shows the results of a study conducted on the yield (in grams) of a chemical produced when heated to different temperatures (in .C). The least square regression line approach was used to establish this relationship. Temperature (C) 20.4 18.7 15.2 27.9 k 30.1 13.8 (x ) Yield (grams) 50 65 80 100 75 120 45 ( 4 ) Table 4 (a) Find, in terms of k, the coordinates of the point that the least square regression line passes through. (b) Given that the least square regression line of yield on temperature is , find k. (19.5 .C) (c) Interpret the regression coefficients. ( (d) Determine the correlation coefficient and interpret the result. (0.8266)