Role #4 Water Analyst

You believe that the answer lies in calculating how much fresh water we use on earth for consumption, agriculture, etc. The table below is the estimated volume of freshwater withdrawn on earth in a year vs. the year the data was taken. 

a)  Create a scatterplot of the data (yearly volume vs. year).

b)  Perform linear regression and exponential regression on your scatterplot.  Which is a better fit? How do you know? What is the best fit equation?

c)  If the average volume of precipitation on earth is 5000 cubic kilometers per year, when will we be using as much as we get from precipitation? How confident are you in this prediction? Why? What factor(s) may also need to be considered?

d)  Present your graphs, equations, calculations and results to the leader and the group.

Source: University of Michigan, “Human Appropriation of the World’s Fresh Water Supply.” http://www.globalchange.umich.edu/

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