In the previous homework, we considered data from four chemical plants that discharged effluents into streams in the vicinity of their locations. to monitor the extent of pollution created by the effluents and to determine whether this differs from plant to plant, the company collected random samples of liquid waste, five specimens from each plant. the data are given in the accompanying table. plant polluting effluents (lb/gal of waste) a 1.65 1.72 1.50 1.37 1.60 b 1.70 1.85 1.46 2.05 1.80 c 1.40 1.75 1.38 1.65 1.55 d 2.10 1.95 1.65 1.88 2.00 we found that there were differences among these plants. in r, use the tukeyhsd function to determine what differences there are among the plants. what plants are different at family-wise error rate (fwer) 0.05