Equations

Question 1

Arithmetic Density

Answer 1

(Density = Population / Area)

Question 2

Physiological Density

Answer 2

(density = farmers/ area)

Question 3

Population

Answer 3

Starting population + (Births – Deaths) + (in migration – out migration)

Question 4

Rate of Natural Increase (RNI)

Answer 4

RNI = (CBR – CDR)

note: make sure its a percent!

Question 5

Crude Birth Rate (CBR)

Answer 5

(Births/Population) x1000

Question 6

Crude Death Rate

Answer 6

(Deaths/Population) x1000

Question 7

Doubling Time

Answer 7

69 / Growth Rate

Question 8

Growth Rate

Answer 8

CBR - CDR +/- NMR

Question 9

BONUS! what years define the BOOMERS

Answer 9

1946 - 1965

Question 10

Calculating cohorts

Answer 10

For males example:
%Males in age group = (Number of males in age group / Total population) x100

Question 11

BONUS! How is NRR related to TFR?

Answer 11

NRR = half of TFR (i.e TFR/2)

Question 12

General Fertility Rate (GFR)

Answer 12

(Births / Females between 15-44) x 1000

Question 13

Age Specific Fertility Rate (ASFR)

Answer 13

female births in cohort / total females in cohort

Ba / Fa (where “a” is the cohort)

Question 14

Net Migration Rate (NMR)

Answer 14

In migration - out migration

Question 15

Environmental Resistance (ER)

Answer 15

fecundity - fertility

Question 16

Sex Ratio (SR)

Answer 16

(Males / Females) x 100

Question 17

Dependency Ratio (DR)

Answer 17

(Dependants / productives) x100

Question 18

Age Specific Death Rate (ASDR)

Answer 18

(D age group / P age group) X 1000

D = Number of deaths of people in age group (1 or 5 year increments)
P = Midyear population in age group

Question 19

Infant mortality rate (IMR)

Answer 19

(Deaths from birth to age 1 / Births) x 1000

Question 20

Neonatal mortality Rate (NMR)

Answer 20

(Deaths from birth to 28 days / births) x 1000