he article “Effect of Varying Solids Concentration and Organic Loading on the Performance of Temperature Phased Anaerobic Digestion Process” discusses experiments to determine the effect of the solids concentration on the performance of treatment methods for wastewater sludge. In the first experiment, the concentration of solids (in g/L) was 43.94 ± 1.18. In the second experiment, which was independent of the first, the concentration was 48.66 ± 1.76. Estimate the difference in the concentration between the two experiments, and find the uncertainty in the estimate.
What will be an ideal response?
Let X be the estimated concentration in the first experiment and let Y be the estimated concentration in the second experiment. Then X = 43.94, ?X= 1.18, and Y = 48.66, 
= 1.76.
The estimated difference is Y?X = 48.66 ? 43.94 = 4.72.
The uncertainty in the estimate is 
.
The differenceis 4.72±2.12 g/L.
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