Two distinct water samples were analyzed for cadmium (Cd) content and the results of 4 replicate measurements for each sample are shown below. Determine whether the means of the two samples are statistically different at the 90% confidence level. Trial 1 2 3 4 Cd in Sample 1 1.20 ppm 1.80 ppm 1.90 ppm 1.70 ppm Cd in Sample 2 1.90 ppm 2.70 ppm 2.10 ppm 2,80 ppm

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