a Plot sales versus time b Estimate the regression model for a linear time trend of sales c What is the mean absolute percent error of the linear regression estimates for these 10 years d Using this model, estimate sales for year 11 Time Index 1 Chapter 4 Problem 9 Nelson Industries' Sales History for the last 10 years 2 3 4 1 Year 2 Dec 08 3 Dec 09 4 Dec 10 5 Dec 11 6 Dec 12 7 Dec 13 8 Dec 14 9 Dec 15 10 Dec 16 11 Dec 17 Sales 945 875 760 690 545 420 305 285 250 210 5 6 7 8 9 10

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Question: a. Plot sales versus time. b. Estimate the regression model for a linear time trend of sales. c. What is the mean absolute percent error

a. Plot sales versus time.

b. Estimate the regression model for a linear time trend of sales.

c. What is the mean absolute percent error of the linear regression estimates for these 10 years?

d. Using this model, estimate sales for year 11.

a. Plot sales versus time. b. Estimate the

Time Index 1 Chapter 4 Problem 9 Nelson Industries' Sales History for the last 10 years 2 3 4 1 Year 2 Dec-08 3 Dec-09 4 Dec-10 5 Dec-11 6 Dec-12 7 Dec-13 8 Dec-14 9 Dec-15 10 Dec-16 11 Dec-17 Sales 945 875 760 690 545 420 305 285 250 210 5 6 7 8 9 10

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