12/13/13

This weekend's homework is to complete Part II of Assignment 28 and read "A Closer Look" and "Working It Out" for 4.1 and 4.2 (p. 64, 66, 68) and add to your reading notes about populations.

Part II: World Population Trends

1650 = 0.5 billion	1940 = 2.3 billion	1980 = 4.4 billion	2000 = 6.1 billion
1750 = 0.7 billion	1950 = 2.5 billion	1985 = 4.8 billion	2003 = 6.3 billion
1850 = 1.1 billion	1960 = 3.0 billion	1990 = 5.3 billion	2008 = 6.7 billion
1900 = 1.6 billion	1970 = 3.6 billion	1995 = 5.5 billion	2013 = 7.1 billion
1930 = 2.1 billion

Using the above information, plot a graph of world population versus time from 1650 to 2013 in

the space below. Use your graph to predict world population for the year 2020 and 2030. (Hint: Use

dotted lines to extend your graph into the future.)

“iPhone Island – Modeling Exponential Growth” Analysis and Thinking Questions

Answer all of the following questions to best of your ability in complete sentences. Use examples, details, and vocabulary to help support your answers.

Part II: Doubling Time of a Population

6. Calculate the growth rate for the U.S. Show your work.

· As of 2012, the population of the U.S. was approximately 313,900,000. The increase in

the U.S. population is approximately 2,200,000 a year, from immigration and new births.

· Growth rate = amount of change in a population/total population x 100.

7. Calculate the doubling rate for the population of the U.S. Show your work.

· To determine doubling time, divide 70 by the population’s growth rate.

8. What inferences and/or connections can you make based on the graph of the United States’ population growth?

9. How did this activity connect to our discussions of population biology this week?