# hw67_09 - STA 6127 Homework 5 Due April 20 Population...

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STA 6127 – Homework 5 – Due April 20 Population Projections Part 1 You are a demographer circa 1920, and have just been given the updated census information from the  1920 U.S. census. You fit the following models to describe the population growth of the U.S. since the  first census (1790). First, convert population to units of Millions by dividing population by million,  and use decade (not year) as X. Use data only up to 1920 (by Selecting Cases) to fit models. The first  three models can be fit using SPSS by selecting: Analyze   Regression   Curve Fitting Dependent Variable: Population (use in millions form)   Independent Variable: Decade  Model 1: Pop = a + b 1 X + b 2 X 2      (Quadratic) Model 2: Pop = a + b 1 X + b 2  X 2  + b 3 X 3      (Cubic) Model 3: Pop = ab X       (Growth) Model 4: Pop = a + b 1 X + b 2 X

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## This note was uploaded on 01/20/2012 for the course STA 6127 taught by Professor Mukherjee during the Spring '08 term at University of Florida.

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hw67_09 - STA 6127 Homework 5 Due April 20 Population...

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