The following data represent the population of the United States from 1790 to 2000.

In Problems 6-12, construct a scatterplot of the given data. Is there a trend in the data?
Are any of the data points outliers? Construct a divided difference table. Is smoothing with a low-order polynomial appropriate? If so, choose an appropriate polynomial and  fit using the least-squares criterion of best fit. Analyze the goodness of fit by examining appropriate indicators and graphing the model, the data points, and the deviations.