Fill in the blank: For these data,  1999  per capita incomes that are less than the mean of the  1999  per capita incomes tend to be paired with  1980  per capita incomes that are _____ the mean of the  1980  per capita incomes. Choose onegreater thanless than 2. According to the regression equation, for an increase of one thousand dollars in  1980  per capita income, there is a corresponding increase of how many thousand dollars in  1999  per capita income?   3. What was the observed  1999  per capita income (in thousands of dollars) when the  1980  per capita income was 7.6 thousand dollars?   4. From the regression equation, what is the predicted  1999  per capita income (in thousands of dollars) when the  1980  per capita income is 7.6 thousand dollars? (Round your answer to at least one decimal place.)

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In ongoing economic analyses, the U.S. federal government compares per capita incomes not only among different states but also for the same state at different times. Typically, what the federal government finds is that "poor" states tend to stay poor and "wealthy" states tend to stay wealthy.

Would we have been able to predict the 

1999
 per capita income for a state (denoted by 
y
) from its 
1980
 per capita income (denoted by 
x
)? The following bivariate data give the per capita income (in thousands of dollars) for a sample of fourteen states in the years 
1980
 and 
1999
 (source: U.S. Bureau of Economic Analysis, Survey of Current Business, May 
2000
). The data are plotted in the scatter plot in Figure 1, and the least-squares regression line is drawn. The equation for this line is 
=y+0.382.75x
 .

 

 
1980
 per capita income, x
(in $1000s)
1999
 per capita income, y
(in $1000s)
South Dakota 8.1 25.1
Utah 8.5 23.4
West Virginia 8.2 20.9
Arkansas 7.6 22.1
Kentucky 8.2 23.2
New Mexico 8.4 22.1
Ohio 10.1 27.1
Minnesota 10.3 30.6
Vermont 8.7 25.9
Alabama 7.9 22.9
Montana 9.1 22.3
Maryland 11.2 32.2
Iowa 9.7 25.7
Washington 10.9 30.3
      
y
20
22
24
26
28
30
32
34
36
38
x
7
8
9
10
11
12
13
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Figure 1
 
Based on the above information, answer the following:

 

1. Fill in the blank: For these data, 
1999
 per capita incomes that are less than the mean of the 
1999
 per capita incomes tend to be paired with 
1980
 per capita incomes that are _____ the mean of the 
1980
 per capita incomes.
Choose onegreater thanless than
2. According to the regression equation, for an increase of one thousand dollars in 
1980
 per capita income, there is a corresponding increase of how many thousand dollars in 
1999
 per capita income?
 
3. What was the observed 
1999
 per capita income (in thousands of dollars) when the 
1980
 per capita income was 7.6 thousand dollars?
 
4. From the regression equation, what is the predicted 
1999
 per capita income (in thousands of dollars) when the 
1980
 per capita income is 7.6 thousand dollars? (Round your answer to at least one decimal place.)
 
 
 
 
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