Population Shift By Stephen Yau, Sarah Lieber, Jaya Bearelly, and Chris Palmer.

Population Shift

By Stephen Yau, Sarah Lieber, Jaya Bearelly, and Chris Palmer

Mean PopulationIf the United States was a tray of weights with each person

represented by an equal weight the mean center would be the point at which the map is completely balanced.

Median PopulationThe point at which there is an equal number of people to

the north and south and to the east and west.

Median Center of Population in the U.S.

1880 39.95 84.12

1890 40.0475 84.6669

1900 40.0589 84.8169

1910 40.1258 85.0333

1920 40.1978 84.7333

1930 40.1978 84.6097

1940 40.0717 84.6697

1950 40.0033 84.9475

1960 39.9403 85.2833

1970 39.7953 85.5286

1980 39.3167 86.1375

1990 38.9653 86.5314

Year Latitude Longitude

Median Center of Population

0

20

40

60

80

100

1850 1900 1950 2000

Year

Lat

itu

de

and

Lo

ng

itu

de

Series1

Series2

Median Center of Population Linear Regressions

• Latitude• y = -.0073046154x +

40.29095385

• Longitude• y = .016327028x +

84.19185513

Predicted Latitude for 2000: 39.4144

Predicted Longitude for 2000: 86.151098

Actual Median Center of Population for 2000 is at Washington, Indiana

Comparison of Our Predicted With the Actual Median Center

of Population

• We predicted that the latitude in 2000 would be 39.4144. It actually is 38.7.

• We predicted that the longitude in 2000 would be 86.151098. It actually is 87.2.

Images through the decades:Life in 1900

1900

Washington DC in 1910

Luxurious Living in 1920

Slums of the 30’s

18 year old French Canadian Wife of a Potato Farmer in 1940

A Couple Mailing a Letter in the 1950’s

Native American Home in 1960

Sulfur Springs, Colorado in 1970

Colorado in 1980

Bush Inauguration in 1989

Millennium Celebration in 2000 in Washington DC

Work Cited

• www.census.gov

• www.loc.gov