DATA ANALYSIS: ELECTRICITY The table shows theaverage prices (in cents per kilowatt
Chapter 8, Problem 92(choose chapter or problem)
DATA ANALYSIS: ELECTRICITY The table shows theaverage prices (in cents per kilowatt hour) of residentialelectricity in the United States from 2000 through 2007.(Source: Energy Information Administration)(a) Use the regression feature of a graphing utility tofind a cubic model for the data. Let represent theyear, with corresponding to 2000.(b) Use the graphing utility to plot the data and themodel in the same viewing window.(c) You want to adjust the model so thatcorresponds to 2005 rather than 2000. To do this,you shift the graph of five units to the left to obtainWrite in standard form.(d) Use the graphing utility to graph in the sameviewing window as(e) Use both models to estimate the average price in2008. Do you obtain the same answer?(f ) Do your answers to part (e) seem reasonable?Explain.(g) What factors do you think may have contributed tothe change in the average price?
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