E-Filing The table shows the numbers of tax returns (in millions) made through e-file from 2007 through 2014. Let f t represent the number of tax returns made through e-file in the year t . (a) Find f 2014 − f 2007 2014 − 2007 and interpret the result in the context of the problem. (b) Make a scatter plot of the data. (c) Find a linear model for the data algebraically. Let N represent the number of tax returns made through e-file and let t = 7 correspond to 2007. (d) Use the model found in part (c) to complete the table. (e) Compare your results from part (d) with the actual data. (f) Use a graphing utility to find a linear model for the data. Let x = 7 correspond to 2007. How does the model you found in part (c) compare with the model given by the graphing utility?
E-Filing The table shows the numbers of tax returns (in millions) made through e-file from 2007 through 2014. Let f t represent the number of tax returns made through e-file in the year t . (a) Find f 2014 − f 2007 2014 − 2007 and interpret the result in the context of the problem. (b) Make a scatter plot of the data. (c) Find a linear model for the data algebraically. Let N represent the number of tax returns made through e-file and let t = 7 correspond to 2007. (d) Use the model found in part (c) to complete the table. (e) Compare your results from part (d) with the actual data. (f) Use a graphing utility to find a linear model for the data. Let x = 7 correspond to 2007. How does the model you found in part (c) compare with the model given by the graphing utility?
Solution Summary: The author analyzes the value of f(2014)-f
E-Filing The table shows the numbers of tax returns (in millions) made through e-file from 2007 through 2014. Let
f
t
represent the number of tax returns made through e-file in the year
t
.
(a) Find
f
2014
−
f
2007
2014
−
2007
and interpret the result in the context of the problem.
(b) Make a scatter plot of the data.
(c) Find a linear model for the data algebraically. Let
N
represent the number of tax returns made through e-file and let
t
=
7
correspond to 2007.
(d) Use the model found in part (c) to complete the table.
(e) Compare your results from part (d) with the actual data.
(f) Use a graphing utility to find a linear model for the data. Let
x
=
7
correspond to 2007. How does the model you found in part (c) compare with the model given by the graphing utility?
Definition Definition Representation of the direction and degree of correlation in graphical form. The grouping of points that are plotted makes it a scatter diagram. A line can be drawn showing the relationship based on the direction of points and their distance from each other.
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