1. Two methods were used to measure the amount of Pb in Manila Bay. The result of six replicates are as follows: ICP-MS (ppm): 13.5, 14.7, 15.8, 15.0, 16.0 AAS (ppm): 15.9, 16.5; 16.8, 17.0,16.6,16.9 a. On the two methods, is there a bad data that can be omitted at 90% CL? b. Determine the range of of values the true value likely falls with 95% CL? C. Are the mean values obtained by these two methods statistically different at 95% CL?​