Studying the demographics in a region

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Reference no: EM131103960

1. A regional planner is studying the demographics in a region of a particular state. She has gathered the following data on nine counties.

County	Median Income	Median Age	Coastal
A	$48,157	57.7	1
B	48,568	60.7	1
C	46,816	47.9	1
D	34,876	38.4	0
E	35,478	42.8	0
F	34,465	35.4	0
G	35,026	39.5	0
H	38,599	65.6	0
J	33,315	27.0	0

a. Is there a linear relationship between the median income and median age?

b. Which variable is the "dependent" variable?

c. Use statistical software to determine the regression equation. Interpret the value of the slope in a simple regression equation.

d. Include the aspect that the county is "coastal" or not in a multiple linear regression analysis using a "dummy" variable. Does it appear to be a significant influence on incomes?

e. Test each of the individual coefficients to see if they are significant.

f. Make a plot of the residuals and comment on whether they appear to follow a nor- mal distribution.

g. Plot the residuals versus the fitted values. Do they seem to have the same amount of variation?

Reference no: EM131103960

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