The following table shows retail sales in drug stores in billions of dollars in the U.S. for years since 1995. Year Retail Sales 0 85.851 3 108.426 6 141.781 9 169.256 12 202.297 15 222.266 Let yy be the retails sales in billions of dollars in xx years since 1995. A linear model for the data is y=9.44 x+ 84.182. A) Use the above scatter plot to decide whether the line of best fit, fits the data well. __?__ The function is a good model for the data. __?__ The function is not a good model for the data B) To the nearest billion, estimate the retails sales in the U. S. in 2012. __?__ billions of dollars. C) Use the equation to find the year in which retails sales will be $249 billion. __?__

The following table shows retail sales in drug stores in billions of dollars in the U.S. for years since 1995. Year Retail Sales 0 85.851 3 108.426 6 141.781 9 169.256 12 202.297 15 222.266 Let yy be the retails sales in billions of dollars in xx years since 1995. A linear model for the data is y=9.44 x+ 84.182. A) Use the above scatter plot to decide whether the line of best fit, fits the data well. ? The function is a good model for the data. ? The function is not a good model for the data B) To the nearest billion, estimate the retails sales in the U. S. in 2012. ? billions of dollars. C) Use the equation to find the year in which retails sales will be $249 billion. ?

Linear Algebra: A Modern Introduction

4th Edition

ISBN:9781285463247

Author:David Poole

Publisher:David Poole

Chapter7: Distance And Approximation

Section7.3: Least Squares Approximation

Problem 31EQ

See similar textbooks

Year	Retail Sales
0	85.851
3	108.426
6	141.781
9	169.256
12	202.297
15	222.266

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