Question

Calculate: What is the population change/growth, natural increase, and net migration for each of the four populations. Fill in the table below. Hint: estimate using the “Demographic Balancing Equation.” Hint: In the table, you can express answers absolute numbers.

	Population		2000-2010		Pop Growth	Natural Increase	Net Migration
	2000	2010	Births	Deaths
Centerville	22400	22100	1872	1018
Kettering	44150	48700	4131	1448
Oakwood	4150	4250	359	175
Beavercreek	11600	11850	1019	478

Calculate: Using data from the above table/calculations, what is the net-migration rate for Oakwood during this ten-year period (2000-2010)? Hint: assume that all migration and natural increase was evenly spaced during the ten-year interval between 2000 and 2010. This assumption should help you figure out an estimate of the mid-year population for Oakwood.    

                                                                                                     ____________________ (per 1000)

Discuss: Using the above data/calculations, can you estimate the gross migration rate of these four populations? Why or Why not?

Answer 1

Solution:

Applying Demographic Balancing Equation we have for above data

Population( 2010)=Population( 2000) + Net increase ( i.e Births - Deaths) + Net Migration.

Hence,

Net Migration= Population( 2010) - Population( 2000) - Net increase ( i.e Births - Deaths)

Hence Table

Population	2000-2010	Pop Growth	Natural Increase		Net Migration
	2000	2010	Births	Deaths
Centerville	22400	22100	1872	1018	-1154
Kettering	44150	48700	4131	1448	1867
Oakwood	4150	4250	359	175	-84
Beavercreek	11600	11850	1019	478	-291

Now for the Net migration rate for Oakwood:

we have Net migration for Oakwood is -84

Net migration rate for Oakwood = (Net Migration / Mid year population) * 1000

we have, for Oakwood,

Mid year population= (Population( 2010) + Population( 2000) ) / 2

= (4250+4150)/2

= 4200

hence,

Net migration rate for Oakwood = (Net Migration / Mid year population) * 1000

= (-84/4200)*1000

= -20

Answer: The net-migration rate for Oakwood during this ten-year period (2000-2010) is -20.

Discussion: We cannot estimate the gross migration rate of these four populations because it refers to the across the boarders migration, Information about across the boarders migration is not available.