Concept explainers
E-Book Revenue The table shows the annual revenues (in billions of dollars) of e-books in the United States from 2009 through 2013. (Source: Statista)
Year | 2009 | 2010 | 2011 | 2012 | 2013 |
Revenue | 0.82 | 1.52 | 2.31 | 3.35 | 4.52 |
A mathematical model for the data is given by
(a) Use a graph and a table to compare the data with the model.
(b) Use the model to predict the revenue in 2018.
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- Fill in the blanks. An r-value, or, of a set of data gives a measure of how well a model fits the data.arrow_forwardDVD Player sales The table shows the number of DVD play-ers sold in a small electronics store in the years 2003-2013. What was the average rate of change of sales between 2003 and 2013? Whatwas the average rate of change of sales between 2003 and 2004? What was the average rate of change of sales between 2004 and 2005? Between which two successive years did DVD player sales increase most quickly?arrow_forwardMortgage Rates The following table is taken from the website of Freddie Mac. It shows rates for 30-year fixed-rate mortgages since 1970. y=Year r=Mortgagerate 1975 9.05 1980 13.74 1985 12.43 1990 10.13 1995 7.93 2000 8.05 2005 5.87 2010 4.69 2015 3.84 a. Explain in practical terms the meaning of r(2003). b. Use the table to estimate the value of r(2003).arrow_forward
- The U.S. Census tracks the percentage of persons 25 years or older who are college graduates. That data forseveral years is given in Table 4[14]. Determine whether the trend appears linear. If so, and assuming the trendcontinues. in what year will the percentage exceed 35%?arrow_forwardFill in the blanks. Statisticians use a measure called the ________ of the ________ ________ to find a model that approximates a set of data most accurately.arrow_forward
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