Q.1. Heavy metals can inhibit the biological treatment of waste in municipal treatment plants. Monthly measurements were made at a state-of-the art treatment plant of the amount of chromium (ug/) in both the influent and effluent. (Courtesy of Paul Berthouex) influent 250 290 270 100 300 410 110 130 1100 affluent 19 10 17 11 70 60 18 30 180 (a)Make scatter plot. (b) Make a scatter plot after taking the natural logarithm of both variables. (c) Calculate the correlation coefficient, r, in part (a) and part (b). (d) Comment on the appropriateness of / in each case