Concept explainers
Remainder Round all answers to two decimal places unless otherwise indicated.
Cell Phones The following table gives the amount spent on cellular service worldwide, in trillions of U.S. dollars. Round the regression parameters to three decimal places.
Date | Cellular service revenue |
2011 | 1.01 |
2012 | 1.05 |
2013 | 1.09 |
2014 | 1.11 |
Plot the data points.
Find the equation of the regression line and add its graph to the plotted data.
In 2015, $1.14 trillion was spent on cellular service. If you had been a financial strategist in 2014 with only the data in the table above available, what would been your prediction for the amount spent on cellular service in 2015?
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Chapter 3 Solutions
Webassign Printed Access Card For Crauder/evans/noell's Functions And Change: A Modeling Approach To College Algebra, 6th Edition, Single-term
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- PSarrow_forwardThe accompanying scatterplot shows the average teacher pay and the per pupil expenditure for 45 states out of the 50 states and the District of Columbia. The regression equation is also shown. Complete parts (a) through (d) below. Click the icon to view the scatterplot of average teacher pay and per pupil expenditures. a. From the scatterplot, is the correlation between average teacher pay and per pupil expenditure positive, negative, or near zero? The correlation is positive, because the scatterplot shows that as average teacher pay increases, the average per pupil expenditure tends to increase, and the regression line has a positive slope. b. What is the slope of the regression equation? Interpret the slope in the context of the problem. Select the correct choice below and fill in the answer bg (Type integers or decimals. Do not round.) Average Teacher Pay and Average Per Pupil Expenditure O A. The slope is For each additional $1 in average per pupil expenditure in a state, the…arrow_forwardAnswer letter DEFarrow_forward
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