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The following data were used in a regression analysis to estimate a demand equat

ID: 1114571 • Letter: T

Question

The following data were used in a regression analysis to estimate a demand equation for recreation visits to a regional park.

Year

Visits in Year t

County population

Income

Price of gasoline

Time Trend

2001

1500

10,000

9,800

1.25

1

2002

1600

10,500

9,950

1.35

2

2003

1900

11,500

10,200

1.15

3

2004

2100

13,000

10,900

1.19

4

2005

2290

14,000

12,000

1.10

5

2006

2300

14,250

12,700

1.15

6

2007

2250

14,500

13,000

1.35

7

2008

2450

16,000

14,000

1.12

8

(15 points) Use the regression output below along with the future values of the explanatory variables to estimate future recreation demand in 2033 and 2053.

Regression Output:

Constant

1511.1

Std Err of Y Est

60.0547

R Squared

0.98727

No. of Observations

8

Degrees of Freedom

3

Population

Income

Price of gas

Trend

Coefficient(s)

0.18308

-0.142

-399.08

64.5077

Std. Err. of Coef.

0.091109

0.07718

378.0335

85.05416

T-statistics

2.009508

-1.8425

-1.05567

0.758431

Future values of the explanatory variables

Year

Population

Income

Price of gas

Trend

2033

21,000

16,000

1.23

32

2053

40,000

18,000

1.23

52

(5 points) Estimate the future values for the results above if the price of gasoline doubles.

Year

Visits in Year t

County population

Income

Price of gasoline

Time Trend

2001

1500

10,000

9,800

1.25

1

2002

1600

10,500

9,950

1.35

2

2003

1900

11,500

10,200

1.15

3

2004

2100

13,000

10,900

1.19

4

2005

2290

14,000

12,000

1.10

5

2006

2300

14,250

12,700

1.15

6

2007

2250

14,500

13,000

1.35

7

2008

2450

16,000

14,000

1.12

8

Explanation / Answer

Given Model:

Future recreation demand = 0.18308*Pop. - 0.142*Income - 399.08*PG + 64.5077*Trend

In 2033,

Future recreation demand = 0.18308*21,000 - 0.142*16,000 - 399.08*1.23 + 64.5077*32 = 3,146.058

In 2053,

Future recreation demand = 0.18308*40,000 - 0.142*18,000 - 399.08*1.23 + 64.5077*52 = 7,630.732

If price of gasoline doubles:

In 2033,

Future recreation demand = 0.18308*21,000 - 0.142*16,000 - 399.08*2.46 + 64.5077*32 = 2,655.1896

In 2053,

Future recreation demand = 0.18308*40,000 - 0.142*18,000 - 399.08*2.46 + 64.5077*52 = 7,139.8636

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