This is a common core "type" of performance task looking at both exponential functions and linear functions when it comes to population growth. It asks numerous reasoning questions with data and math questions in between. Students are asked to come up with a linear model in slope intercept form looking at a population in 1980 and then again in 2000. It also asks students to come up with an exponential model using that same data. The students will also need to graph (on a separate sheet of paper both models to try and determine which model of better use to predict future populations. It then asks to predict what the population will be in 2011, and asks students to use both models when calculating. After they have calculated the population using both models, the worksheet gives what the actual population was in the year 2011 and asks various questions on which model works better, why it works better, what factors affect population growth and so on and so forth.
As common core is among us this is a higher level of critical thinking that is both mathematically difficult (uses various mathematical skills) and has high application.