Welcome!
Please get out your histogram
and demographic transition
worksheet from this weekend
for an extra credit stamp!
Please read the board!
Reading skills and
graph interpretation
Demographers use histograms

Graph of age
distribution at
particular time
 Cohort
size
 Male vs. female
 Pre-reproductive
 Reproductive ages
 Post reproductive
Cohorts move up graph as they
age – US baby boomers (1946-1964)
US generations




Baby boomers (19461964)
X generation/ baby
bust – (1965-1976)
Echo boom /
Generation Why (Y)
(1977-2000)
Millennial generation
(2000-2010)



Social and economic
considerations:
Geriatric or infant
health care?
Education or
retirement spending?
Histograms can also be used to predict
future population trends based on an
important assumption
Check for understanding
What is the name of these graphs?
 What do the horizontal thirds represent?
 What do the two sides represent?
 Which cohort would tell you about IMR?
 What aspect do you consider when
predicting future population trends?
 What assumption is made in making future
populations with these graphs?

The second important graph
Check for understanding
Why does death rate fall with industrialization?
Why does birth rate fall?
Why does death rate fall first?
At what two points is growth stable?
Whole Earth Discipline – #3 Based on this reading,
would the author agree or disagree with the
demographic transition theory? Provide multiple
examples from the text to defend your argument.
HOW DO YOU ANSWER THIS QUESTION???
Check out these histograms

http://www.census.gov/ipc/www/idb/inform
ationGateway.php