Phosphorus is a chemical that is found in many household cleaning products. Unfortunately, phosphorus also finds its way into surface water, where it can harm fish, plants, and other wildlife. Two methods of phosphorus reduction are being studied. At a random sample of 7 locations, both methods were used and the total phosphorus reduction (mg/L) was recorded

Do these data indicate a difference (either way) in the average reduction of phosphorus between the two methods? Use α = 0.05.

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Site Method I 0.013 0.030 0.015 0.055 0.007 0.002 0.010 Method II 0.014 0.058 0.017 0039 0.017 0.001 0.013 1 2 345 6 7