2. Four chemical plants discharge effluents into streams in the vicinity of their locations. To determine...

2. Four chemical plants discharge effluents into streams in the vicinity of their locations. To determine if there is any difference in the extent of pollution created by the effluents, five samples of liquid waste were collected from each plant. The data collected is as follows: 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 2.00 D 2.10 1.95 1.65 1.88 2.00 (b) Do the data provide sufficient evidence to indicate a difference in the mean weight of effluents per gallon in the effluents discharged from the four plants? Test using α = 0.05.

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