Concept explainers
Electricity
The table shows the average prices
Year | Average Price,
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2007 |
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2008 |
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2009 |
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2010 |
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2011 |
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2012 |
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2013 |
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2014 |
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a) Use the regression feature of a graphing utility to find a cubic model for the data. Let
b) Use the graphing utility to plot the data and the model in the same viewing window.
c) You want to adjust the model so that
d) Use the graphing utility to graph
e) Use both models to predict the average price in 2015. Do you obtain the same answer?
f) Do your answers to part (e) seem reasonable? Explain.
g) What factors do you think contributed to the change in the average price?
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Chapter 9 Solutions
Precalculus (MindTap Course List)
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